Remove dead code (#1303)

The review on https://github.com/ansible/ansible-modules-extras/pull/1303
show the problem was already fixed, so we just need to remove the
code.

system/firewalld.py

@@ -328,14 +328,6 @@ def main():
     timeout = module.params['timeout']
     interface = module.params['interface']
 
-    ## Check for firewalld running
-    try:
-        if fw.connected == False:
-            module.fail_json(msg='firewalld service must be running')
-    except AttributeError:
-        module.fail_json(msg="firewalld connection can't be established,\
-                version likely too old. Requires firewalld >= 2.0.11")
-
     modification_count = 0
     if service != None:
         modification_count += 1