Add information about interrupted conversion/dist-upgrade to stdout and motd

[SandakovMM]

No description provided.

[ukablan-wpc]

What about mentioning about the program name?

[ukablan-wpc]

Can you also share the console outputs when you try it?

[SandakovMM]

Sure, no problem:

# ./centos2alma 
Doing preparation checks...
^CThe dist-upgrade process was stopped by signal 2. Please use the `centos2alma --revert` option before trying again.
# exit
logout
Connection to plesk-cos-7-1 closed.
~ [1]$ ssh root@XXX

===============================================================================
Message from the Plesk dist-upgrader tool:

    The dist-upgrade process was stopped by signal.
    Please use the `centos2alma --revert` option before trying again.
    You can remove this message from the /etc/motd file.
===============================================================================

[ukablan-wpc]

Sure, no problem:

# ./centos2alma 
Doing preparation checks...
^CThe dist-upgrade process was stopped by signal 2. Please use the `centos2alma --revert` option before trying again.
# exit
logout
Connection to plesk-cos-7-1 closed.
~ [1]$ ssh root@XXX

===============================================================================
Message from the Plesk dist-upgrader tool:

    The dist-upgrade process was stopped by signal.
    Please use the `centos2alma --revert` option before trying again.
    You can remove this message from the /etc/motd file.
===============================================================================

Does it revert motd message when we revert?

[SandakovMM]

Yes. --revert restores motd file from backup