Modify PatchLineComment parser to incorporate status

In anticipation of the ability to write draft PatchLineComments to
NoteMaps, I modified some of the parsing code for reading comments out
of NoteMaps to take status as a parameter so that when it parses a
List of PatchLineComments out of the notes, they have the correct
status. This is valid to do because all comments in the same note
will all have the same status.

Additionally, I had to modify the ChangeNotesTest class in combination
with this to make sure that the comments being created for testing
purposes had the status flag set correctly.

Change-Id: If32e7075427abd2e6f02721824e8099243806243
3 files changed