Support for writing annotation properties to CSV.

This will be used to pull out trackingBug and maybe other information in
future for putting into a dremel table.

Tidy up a little technical deby while we're here.

Test: atest class2greylisttest
Bug: 117314178
Change-Id: Id50cb3aa042e2df1e96d34bf19e4d9ca0b1fc593