Record use of metadata encryption in property

Bug: 152150018
Test: Cuttlefish with and without keydirectory option
Cherry-Picked-From: 94abae03a97bf67bc2cd04b6a74e07ed08bf30a0
Merged-In: I400873ec207cb63f0407fefc83962bb3a927e294
Change-Id: I400873ec207cb63f0407fefc83962bb3a927e294
1 file changed