Merge "DO NOT MERGE: Bump CTS and CTS Verifier to 6.0_r21" into marshmallow-cts-dev am: fb2e015eaa  -s ours am: c20243add0 am: e58ba61773 am: b5aa45badd am: 63e50972e3  -s ours am: f668643b4d
am: 2f61f98955

Change-Id: I3bdf5be33eb89781151575d64c25b3ddb8e247ef