Cherry-pick cleartext blocking CTS tests

The tests landed in master after the nyc-dev cut.

Bug:27293197
(cherry-picked from commits b617aceda80553cb25e7221e226d8a414f11c5c9,
dc77100fc7556da219fbd86c80a479be212bfdca)

Change-Id: Ifc96f8c13a3f42f27f129b9edaf7ac41515f95d5
7 files changed