Do not mark "skipped" when changed is false

When using the "creates" option with the uri module, set changed
to False if the file already exists. This behavior is consistent with
other modules which use "creates", such as command and shell.

lib/ansible/modules/network/basics/uri.py

@@ -381,7 +381,7 @@ def main():
         # of uri executions.
         creates = os.path.expanduser(creates)
         if os.path.exists(creates):
-            module.exit_json(stdout="skipped, since %s exists" % creates, skipped=True, changed=False, stderr=False, rc=0)
+            module.exit_json(stdout="skipped, since %s exists" % creates, changed=False, stderr=False, rc=0)
 
     if removes is not None:
         # do not run the command if the line contains removes=filename
@@ -389,7 +389,7 @@ def main():
         # of uri executions.
         v = os.path.expanduser(removes)
         if not os.path.exists(removes):
-            module.exit_json(stdout="skipped, since %s does not exist" % removes, skipped=True, changed=False, stderr=False, rc=0)
+            module.exit_json(stdout="skipped, since %s does not exist" % removes, changed=False, stderr=False, rc=0)
 
 
     # httplib2 only sends authentication after the server asks for it with a 401.