Modify the way we set the localization environment

Previously, we set the LANG (and LC_CTYPE) environment variables
directly in the module code and applied them with os.environ().
Instead, we are now pre-pending those variables to the environment
string used to execute the command which allows the user to
override the localization values by setting the environment values
directly (even on a per-task basis):

  - subversion: repo=file:///path/to/repos/svn_über dest=/tmp/svntest
    environment:
      LANG: "C"
      LC_CTYPE: "en_US.UTF-8"

So if a user wishes to default their LANG back to C, they can still
avoid unicode issues by doing the above.

Fixes #7060

lib/ansible/module_utils/basic.py

@@ -30,7 +30,6 @@
 # == BEGIN DYNAMICALLY INSERTED CODE ==
 
 MODULE_ARGS = "<<INCLUDE_ANSIBLE_MODULE_ARGS>>"
-MODULE_LANG = "<<INCLUDE_ANSIBLE_MODULE_LANG>>"
 MODULE_COMPLEX_ARGS = "<<INCLUDE_ANSIBLE_MODULE_COMPLEX_ARGS>>"
 
 BOOLEANS_TRUE = ['yes', 'on', '1', 'true', 1]
@@ -191,8 +190,6 @@ class AnsibleModule(object):
                 if k not in self.argument_spec:
                     self.argument_spec[k] = v
 
-        os.environ['LANG'] = MODULE_LANG
-        os.environ['LC_CTYPE'] = MODULE_LANG
         (self.params, self.args) = self._load_params()
 
         self._legal_inputs = ['CHECKMODE', 'NO_LOG']