test_boot_server_from_encrypted_volume_luks skip condition

test_boot_server_from_encrypted_volume_luks is expected to use
the same feature flag as the other volume encryption tests.

The encryption can be disabled also when the system does not
have suitable keymgr.

Change-Id: I4216a002e22a2392417d9f7d3055c8cdad4a9600
1 file changed