Enable server process forking by default on RedHat

The init scripts that are provided assume that forking is enabled by
default. This has been left in defaults, to preserve the capability for
users to override this option.

Author: danielwhite

defaults/main.yml

@@ -23,7 +23,9 @@ mongodb_net_maxconns: 65536                      # Max number of simultaneous co
 mongodb_net_port: 27017                          # Specify port number
 
 ## processManagement Options
-mongodb_processmanagement_fork: false            # Fork server process
+# Fork server process
+# Enabled by default for RedHat as the init scripts assume forking is enabled.
+mongodb_processmanagement_fork: "{{ 'RedHat' == ansible_os_family }}"
 
 ## security Options
 # Disable or enable security. Possible values: 'disabled', 'enabled'