Update mongodb bootstrap tasks

When deploying on hosts with PyMongo version > 3.0, as found
on Xenial hosts, The bootstrap playbook will fail due to the
following error:

  'The localhost login exception only allows the first admin account to be created'

To resolve this error a "root" user create and password setup
has been added to the tasks and the required login credentials
have been passed to the ceilometer and aodh tasks.

Change-Id: Iaa29b4256dd4b3ac0774a05fc55f5b845ee57732
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

tests/roles/bootstrap-host/defaults/main.yml

@@ -90,6 +90,9 @@ bootstrap_host_mongodb_users: "{{ bootstrap_host_mongodb_service }}"
 #
 # Specify the IP address of a MongoDB Host.
 bootstrap_host_mongodb_address: 172.29.236.100
+#
+# Specify the password to be used with the first mongo admin user
+bootstrap_host_mongodb_password: SuperSecrete
 
 ### Optional Settings ###
 

tests/roles/bootstrap-host/tasks/prepare_mongodb_users.yml

@@ -18,9 +18,22 @@
   tags:
     - mongodb-secrets
 
+- name: Add admin user
+  mongodb_user:
+    login_host: "{{ bootstrap_host_mongodb_address }}"
+    database: admin
+    name: root
+    password: "{{ bootstrap_host_mongodb_password }}"
+    roles: 'root'
+    state: present
+  tags:
+    - mongodb-create-user-admin
+
 - name: Add ceilometer database user
   mongodb_user:
     login_host: "{{ bootstrap_host_mongodb_address }}"
+    login_user: "root"
+    login_password: "{{ bootstrap_host_mongodb_password }}"
     database: ceilometer
     name: ceilometer
     password: "{{ ceilometer_container_db_password }}"
@@ -32,6 +45,8 @@
 - name: Add aodh database user
   mongodb_user:
     login_host: "{{ bootstrap_host_mongodb_address }}"
+    login_user: "root"
+    login_password: "{{ bootstrap_host_mongodb_password }}"
     database: aodh
     name: aodh
     password: "{{ aodh_container_db_password }}"