Fedora mariadb: disable cracklib

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
(cherry picked from commit 13e81ad1cf)

lib/databases/mysql

@@ -71,6 +71,10 @@ function configure_database_mysql {
     elif is_fedora; then
         mysql=mariadb
         my_conf=/etc/my.cnf
+        local cracklib_conf=/etc/my.cnf.d/cracklib_password_check.cnf
+        if [ -f "$cracklib_conf" ]; then
+            inicomment -sudo "$cracklib_conf" "mariadb" "plugin-load-add"
+        fi
     else
         exit_distro_not_supported "mysql configuration"
     fi