Validate SSL certs accessed through urllib*

* Adds another module utility file which generalizes the
  access of urls via the urllib* libraries.
* Adds a new spec generator for common arguments.
* Makes the user-agent string configurable.

Fixes #6211

lib/ansible/module_utils/basic.py

@@ -60,6 +60,7 @@ import grp
 import pwd
 import platform
 import errno
+import tempfile
 
 try:
     import json
@@ -115,6 +116,7 @@ FILE_COMMON_ARGUMENTS=dict(
     remote_src = dict(), # used by assemble
 )
 
+
 def get_platform():
     ''' what's the platform?  example: Linux is a platform. '''
     return platform.system()
@@ -189,7 +191,7 @@ class AnsibleModule(object):
         os.environ['LANG'] = MODULE_LANG
         (self.params, self.args) = self._load_params()
 
-        self._legal_inputs = [ 'CHECKMODE', 'NO_LOG' ]
+        self._legal_inputs = ['CHECKMODE', 'NO_LOG']
         
         self.aliases = self._handle_aliases()
 
@@ -572,8 +574,9 @@ class AnsibleModule(object):
 
     def _check_invalid_arguments(self):
         for (k,v) in self.params.iteritems():
-            if k in ('CHECKMODE', 'NO_LOG'):
-                continue
+            # these should be in legal inputs already
+            #if k in ('CHECKMODE', 'NO_LOG'):
+            #    continue
             if k not in self._legal_inputs:
                 self.fail_json(msg="unsupported parameter for module: %s" % k)
 
@@ -1093,4 +1096,3 @@ class AnsibleModule(object):
                 break
         return '%.2f %s' % (float(size)/ limit, suffix)
 
-