Add tests for shared aa library functions used in command line scripts

Currently none of the command line Python tools (e.g. aa-logprof, aa-genprof and in future aa-notify) have tests. The first step towards such tests is to have a basic baseline tester that imports and inits the AA libs in the way a command line tool would (thus this is not duplicate to that the test-aa.py does).

This helps solve in a separate step the general library layout/architecture issues that currently hold back the aa-notify Python implementation and it's tests.