cloudstack: remove duplicate import cs handling, already in utils.

lib/ansible/modules/extras/cloud/cloudstack/cs_firewall.py

@@ -203,12 +203,6 @@ network:
   sample: my_network
 '''
 
-try:
-    from cs import CloudStack, CloudStackException, read_config
-    has_lib_cs = True
-except ImportError:
-    has_lib_cs = False
-
 # import cloudstack common
 from ansible.module_utils.cloudstack import *
 
@@ -405,9 +399,6 @@ def main():
         supports_check_mode=True
     )
 
-    if not has_lib_cs:
-        module.fail_json(msg="python library cs required: pip install cs")
-
     try:
         acs_fw = AnsibleCloudStackFirewall(module)