"no buildable Go source files" when running "go build"

[ghost]

With the newest version of Snap (i.e. commit 668a381e3f603991e35639a02b0492a97cec152f) snap-plugin-utilities do not compile. Command "make" doesn't work, as the "go build" command returns error: can't load package: package github.com/intelsdi-x/snap-plugin-utilities: no buildable Go source files in /home/mkuculyma/snap/src/github.com/intelsdi-x/snap-plugin-utilities

How to reproduce:

• pull the newest version of Snap master (668a381e3f603991e35639a02b0492a97cec152f)
• git clone https://github.com/intelsdi-x/snap-plugin-utilities
• run "make" in snap-plugin-utilities

[mkleina]

@mkuculyma Do you know if it worked in the past? I never tried running make on library itself, but I think that build scripts are independent from the snap repo and Makefile is just useless here at the moment, because there is no "main.go" available in the root folder. You need to include library inside your code first.

Right now, to build library, you need to change dir to certain subpackage and then run go build, for example:

$ cd ns
$ go build

or for running unit tests:

$ cd ns
$ go test -tags unit

I think it is good idea to modify build script to go through library subpackages and run go build (or go test for unit tests if available) in every subpackage directory.

cc @intelsdi-x/plugin-maintainers what do you think?