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_common.py

@@ -28,7 +28,6 @@ from ansible import constants as C
 
 REPLACER = "#<<INCLUDE_ANSIBLE_MODULE_COMMON>>"
 REPLACER_ARGS = "\"<<INCLUDE_ANSIBLE_MODULE_ARGS>>\""
-REPLACER_LANG = "\"<<INCLUDE_ANSIBLE_MODULE_LANG>>\""
 REPLACER_COMPLEX = "\"<<INCLUDE_ANSIBLE_MODULE_COMPLEX_ARGS>>\""
 
 class ModuleReplacer(object):
@@ -140,12 +139,10 @@ class ModuleReplacer(object):
                 encoded_args = repr(module_args.encode('utf-8'))
             except UnicodeDecodeError:
                 encoded_args = repr(module_args)
-            encoded_lang = repr(C.DEFAULT_MODULE_LANG)
             encoded_complex = repr(complex_args_json)
 
             # these strings should be part of the 'basic' snippet which is required to be included
             module_data = module_data.replace(REPLACER_ARGS, encoded_args)
-            module_data = module_data.replace(REPLACER_LANG, encoded_lang)
             module_data = module_data.replace(REPLACER_COMPLEX, encoded_complex)
 
             if module_style == 'new':
@@ -154,7 +151,6 @@ class ModuleReplacer(object):
                     facility = inject['ansible_syslog_facility']
                 module_data = module_data.replace('syslog.LOG_USER', "syslog.%s" % facility)
 
-
             lines = module_data.split("\n")
             shebang = None
             if lines[0].startswith("#!"):