Provide better default user for a RedHat based OS

While we could define this in the per-platform variables, including this
in the defaults maintains backwards compatability for users that want to
override this value.

Author: danielwhite

README.md

@@ -41,7 +41,7 @@ mongodb_pymongo_from_pip: true                   # Install latest PyMongo via PI
 mongodb_user_update_password: "on_create"        # MongoDB user password update default policy
 mongodb_manage_service: true
 
-mongodb_user: mongodb
+mongodb_user: "{{ 'mongod' if ('RedHat' == ansible_os_family) else 'mongodb' }}"
 mongodb_uid:
 mongodb_gid:
 mongodb_daemon_name: "{{ 'mongod' if ('mongodb-org' in mongodb_package) else 'mongodb' }}"

defaults/main.yml

@@ -10,7 +10,7 @@ mongodb_force_wait_for_port: false
 mongodb_user_update_password: "on_create"        # MongoDB user password update default policy
 mongodb_manage_service: true
 
-mongodb_user: mongodb
+mongodb_user: "{{ 'mongod' if ('RedHat' == ansible_os_family) else 'mongodb' }}"
 mongodb_uid:
 mongodb_gid:
 mongodb_daemon_name: "{{ 'mongod' if ('mongodb-org' in mongodb_package) else 'mongodb' }}"