[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