[OOM][OOF-HAS] Use basic password strength to avoid dollar sign

[OOM][OOF-HAS] Use basic password strength to avoid dollar sign

OOF HAS controller uses Python oslo library to manage config files.
In Python configuration files dollar sign ($) is used to reference other values.
If that sign is in generated password container can't parse configuration file
and exits with error.
Basic password strength means it will use only alphanumberic characters.

Issue-ID: OPTFRA-1028
Signed-off-by: Michal Jagiello <michal.jagiello@t-mobile.pl>
Change-Id: Id31d6f21f22dab93386ea36e2aa026f70367c2e0
(cherry picked from commit 259e8762948abfe1292feafffbedbd26866f63e5)