goferd.service is failing, when starting without network ready

[jortel]

https://bugzilla.redhat.com/show_bug.cgi?id=1681182

Description of problem:
If network is not already online and in case network.service is disabled, the goferd.service will report error in logs.

How reproducible:
maybe only in slow networks, where assinging IP take some time

Steps to Reproduce:

1. install client from satellite-6
2. disable network.service on client
3. boot client

Actual results:
Feb 06 10:57:23 sample-host goferd[14030]: [WARNING][MainThread] gofer.agent.plugin:647 - plugin:demo, DISABLED
Feb 06 10:57:23 sample-host goferd[14030]: [INFO][Thread-1] gofer.rmi.store:108 - Using: /var/lib/gofer/messaging/pending/demo
Feb 06 10:57:23 sample-host goferd[14030]: [INFO][Thread-2] gofer.rmi.store:108 - Using: /var/lib/gofer/messaging/pending/katello
Feb 06 10:57:23 sample-host goferd[14030]: [INFO][MainThread] gofer.agent.plugin:692 - plugin:katello loaded using: katello.agent.goferd.plugin
Feb 06 10:57:23 sample-host goferd[14030]: [INFO][MainThread] rhsm.connection:871 - Connection built: host=sat-qs.wob.vw.vwg port=443 handler=/rhsm auth=identity_cert ca_dir=/etc/rhsm/ca/ insecure=False
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 - [Errno -2] Name or service not known
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 - Traceback (most recent call last):
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib/python2.7/site-packages/katello/agent/goferd/plugin.py", line 197, in validate_registration
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     consumer = uep.getConsumer(consumer_id)
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 1105, in getConsumer
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     return self.conn.request_get(method)
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 693, in request_get
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     return self._request("GET", method, headers=headers)
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 719, in _request
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     info=info, headers=headers)
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 557, in _request
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     conn.request(request_type, handler, body=body, headers=final_headers)
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib64/python2.7/httplib.py", line 1041, in request
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     self._send_request(method, url, body, headers)
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib64/python2.7/httplib.py", line 1075, in _send_request
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     self.endheaders(body)
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib64/python2.7/httplib.py", line 1037, in endheaders
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     self._send_output(message_body)
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib64/python2.7/httplib.py", line 881, in _send_output
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     self.send(msg)
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib64/python2.7/httplib.py", line 843, in send
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     self.connect()
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib64/python2.7/httplib.py", line 1251, in connect
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     HTTPConnection.connect(self)
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib64/python2.7/httplib.py", line 824, in connect
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     self.timeout, self.source_address)
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -   File "/usr/lib64/python2.7/socket.py", line 553, in create_connection
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 -     for res in getaddrinfo(host, port, 0, SOCK_STREAM):
Feb 06 10:57:23 sample-host goferd[14030]: [ERROR][MainThread] katello.agent.goferd.plugin:206 - gaierror: [Errno -2] Name or service not known
Feb 06 10:57:23 sample-host goferd[14030]: [WARNING][MainThread] katello.agent.goferd.plugin:87 - [Errno -2] Name or service not known

Expected results:
service should start without any error reporting.

Additional info:
It's possible to fix this, when the service-unit is changed like.

 [Unit]
 Description=Gofer Agent
-After=network.target
+After=network-online.target
+Wants=network-online.target