Merge changes If02db179,Ic24aa25e,Icf205d03,I9856b08f,I6fc9fcef, ...

* changes:
  vndk-def: Refine test_command_deps_insight
  vndk-def: Fix trivial pylint errors
  vndk-def: Unhide a test case
  vndk-def: Fix deprecated warning in unittest
  vndk-def: Cleanup import pylint errors
  vndk-def: Fix spacing errors found by pylint
  vndk-def: Separate methods with two empty lines
  vndk-def: Cleanup dep-graph
  vndk-def: Mark --output as a required argument