Adding what is needed to have Fenix running in DevStack
Default workflow dependent configuration needs to be documented
Separately. Those might be ssh capability for Fenix service
user and AODH configuration. Test case should also add those in
future.
story: 2005166
Task: #29900
Change-Id: Ifb6602b67f098bcffdc2c03c31fdf868ab61b653
Signed-off-by: Tomi Juvonen <tomi.juvonen@nokia.com>