IndexDiff: support state [removed, untracked]

IndexDiff was extended to detect files which are both removed from the
index and untracked.  Before this change these files were only added
to the removed collection.

Change-Id: I971d8261d2e8932039fce462b59c12e143f79f90
Signed-off-by: Jens Baumgart <jens.baumgart@sap.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2 files changed