Support python lint for the automated builds.

[govint]

Install pylint in the docker image, Invoke lint on esx_service/Makefile.

[govint]

Add test code for pylint as well, the function calling style of naming the arg names in the calls makes it necessary to go fix every site that calls a function in the python code. Its not universally followed in all of the python code but is a source of failures.

[msterin]

As #721 indicates, we drift from good state pretty fast. Elevating priority and assigning to myself, will do ASAP

[govint]

There are a lot of errors reported by pylint on syntax. Possibly, this needs to be a make target and a checklist in a PR to have pylint verified for at least new code.

[msterin]

I plan to make build fail if pylint returns errors. We will start adding more checks and warning after that

[msterin]

Fixed by #739