Merge "DO NOT MERGE: Skip data saver related tests if the device doesn't support it." into nougat-cts-dev am: 43a0aa48b0  -s ours am: c2d5cad508 am: 1f0b508fdb  -s ours am: 9b7a1b42d8 am: 5ff95d1e90 am: 4952b4fce2  -s ours
am: 7f56036ca1

Change-Id: I2f77c6b4cef68ef6f2c4e53bd76f1449fadd5154