The user_id has always been returned for the keypair create and
show operations. The user_id has never been returned in the list
response. The docs were a bit confusing for create and show since
they said 'New in version 2.10' for the user_id description in the
response.
This change clarifies the response docs so that we don't make it
sound like user_id is only getting returned for create/show with
microversion 2.10 and removes user_id from the response docs for
the list operation.
Change-Id: I4bd06c8ed88e526f44bb0d6e927c09175bf103b1
Closes-Bug: #1638606
be11fab555