One transaction per encrypt/decrypt batch
One transaction per encrypt/decrypt batch

Previously, there was one (potentially quite large) transaction across
all batches of templates and resources when encrypting/decrypting
parameters and properties data via the rpc api.

Change-Id: Iba10b7c9e88a1ae3d94ab9ddf4a8e362e72c0d50

openstack/heat,openstack/heat,noironetworks/heat,noironetworks/heat