In some cases it is useful to be able to just configure
the service in Keystone and not the service user. This
is the case when e.g. a read only LDAP backend is used.
Added a parameter configure_user (defaults to true).
Change-Id: I610c9c238de9a1be0203a9dc5bb8845d3eb753ea
Closes-Bug: 1360232
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>