Fix a few issues with procstats associations:

- Use the correct state when comparing the association
  with the process.  (Was causing warning spam as well.)

- Don't wtf if we call startAssociationIfNeeded() no a
  ServiceRecord that doesn't have a process...  that is normal
  when first bringing up a service.

Also add a switch to turn this all off, which for now is
leaving it on.

Test: manual
Bug: 111391911
Bug: 111302807
Bug: 111131998

Change-Id: I2d3f43fd99c7ade24c867ad80a728d898ab0e6c5