Consolidate Python and Deb version

[vpetersson]

As it stands right now, we have two different versions of the agent (in the same repo):

• The Python version
• The Debian package version

let's consolidate the two are coupled right now anyway.

[a-martynovich]

took this

[a-martynovich]

@vpetersson How do we manage versions?

In #51 you suggested to use short hash as part of version number. That means we'll have e.g. 0.1.5.aabbccdd instead of 0.1.5.9.

But the first three parts of the version (0.1.5) should still be managed manually. I changed 0.1.4 to 0.1.5 when I made #35 because it was sort of a major change.

I'm suggesting to put this manually managed version into a VERSION file at the root of the repo. This file will be used to build complete version string both for setuptools (setup.py) and debian package (changelog).

[vpetersson]

Yes, managing the first three parts of the semantic versioning makes sense to do by hand. Having this managed in a file, such as VERSION, make sense to me.