Cleanup debug log statements in call settings.

I think this is my final CL to try to tidy up things before trying
to move everything over to the voicemail activity.

- Try to remove rendundant debug statements, or logs where they
were printed in both the error/success cases.

- Try to make them more concise so they can fit on one line when
possible; that way the code reads easier.

- Some trivial formatting/readibility fixes.

Bug: 17019623
Change-Id: Id19df4ae681baa362c0d7873f1667780737908f0
1 file changed