(trivial) indiciate certain calls return a List

"List entities ..." rather than "Get entities ..."

Change-Id: I463a0801a7fbc04d537e61f3cfbf115737f35acb
Remove old refs to Policy's endpoint_id attr

Change-Id: I9686e4080f46988c41b3872cb85d111d0daf9ecb
Add Credential's user_id to examples (req attr)

Change-Id: I45e447e8bce7fb86724ab9351e423b63284b5d2f
Merge "Add Credential's user_id to examples (req attr)"
Merge "Remove old refs to Policy's endpoint_id attr"