In Fedora mariadb, cracklib has been enabled [0] in order to verify the
password strength.
Disable cracklib in Fedora devstack in order to allow simple passwords
in dev environments.
[0] https://src.fedoraproject.org/cgit/rpms/mariadb.git/
commit: 9442da192282aa74f43e86c96202109a173bbaba
Change-Id: I2d5e965f0f19f86992794eec78134e862899c931