sys.exit used, but not imported.

network/dnsimple.py

@@ -130,12 +130,13 @@ EXAMPLES = '''
 '''
 
 import os
+from sys import exit
 try:
     from dnsimple import DNSimple
     from dnsimple.dnsimple import DNSimpleException
 except ImportError:
     print "failed=True msg='dnsimple required for this module'"
-    sys.exit(1)
+    exit(1)
 
 def main():
     module = AnsibleModule(