testable playbook w/ state wanted pattern

* remove complicated redis config assembly
* backup and restore discover credentials rather than requiring
* backup strategy no longer drops the db. This allows awx user to
restore without creatdb persmission.
* removed mongo from backup/restore

* added password change support for redis, pg, munin
* added update_password command and respective tests

* tests for munin, pg, redis password change
* unit tests for munin, redis password change
* tests for postgres host (ip and socket) change
* tests for postgres backup/restore on remote db

awx/main/management/commands/update_password.py

@@ -0,0 +1,45 @@
+# Copyright (c) 2016 Ansible, Inc.
+# All Rights Reserved
+
+# Python
+from optparse import make_option
+
+# Django
+from django.core.management.base import BaseCommand
+from django.core.management.base import CommandError
+from django.contrib.auth.models import User
+
+class UpdatePassword(object):
+    def update_password(self, username, password):
+        changed = False
+        u = User.objects.get(username=username)       
+        if not u:
+            raise RuntimeError("User not found")
+        check = u.check_password(password)
+        if not check:
+            u.set_password(password)
+            u.save()
+            changed = True
+        return changed
+
+class Command(BaseCommand):
+    option_list = BaseCommand.option_list + (
+        make_option('--username', dest='username', action='store', type='string', default=None,
+                    help='username to change the password for'),
+        make_option('--password', dest='password', action='store', type='string', default=None,
+                    help='new password for user'),
+    )
+
+    def handle(self, *args, **options):
+        if not options['username']:
+            raise CommandError('username required')
+        if not options['password']:
+            raise CommandError('password required')
+
+        cp = UpdatePassword()
+        res = cp.update_password(options['username'], options['password'])
+        if res:
+            return "Password updated"
+        return "Password not updated"
+
+