Distributed Cloud manager need to know about Barbican user in order
to retrieve its username and password for subclouds configuration in
the config_subcloud script.
Change-Id: I59d5a2fd79a88ba1690b1586fbd0c426d6bc114a
Story: 2003108
Task: 27700
Signed-off-by: Alex Kozyrev <alex.kozyrev@windriver.com>