This changes create a trust to use ids instead of names because of
the possibility of roles sharing a name. Even if the user
uniquely identified a role by inputting the id, the request sent
to the identity service would used the name, therefore the command
would fail in the case that two roles share a name.
This does not change how trusts are displayed during trust list or
trust show, a name will still be shown instead of an id.
Depends-On: I38e0ac35946ee6e53128babac3ea759a380572e0
Change-Id: I5bdf89f1e288954a7f5c2704231f270bc7d196f5
Closes-Bug: 1696111
da53c2b334