Controller-side module caching.

This makes our recursive, ast.parse performance measures as fast as
pre-ziploader baseline.

Since this unittest isn't testing that the returned module data is
correct we don't need to worry about os.rename not having any module
data.  Should devise a separate test for the module and caching code

hacking/test-module

@@ -29,12 +29,14 @@
 #    test-module -m ../library/file/lineinfile -a "dest=/etc/exports line='/srv/home hostname1(rw,sync)'" --check
 #    test-module -m ../library/commands/command -a "echo hello" -n -o "test_hello"
 
-import sys
 import base64
+from multiprocessing import Lock
+import optparse
 import os
 import subprocess
+import sys
 import traceback
-import optparse
+
 import ansible.utils.vars as utils_vars
 from ansible.parsing.dataloader import DataLoader
 from ansible.parsing.utils.jsonify import jsonify
@@ -133,10 +135,12 @@ def boilerplate_module(modfile, args, interpreter, check, destfile):
 
     modname = os.path.basename(modfile)
     modname = os.path.splitext(modname)[0]
+    action_write_lock = Lock()
     (module_data, module_style, shebang) = module_common.modify_module(
         modname,
         modfile,
         complex_args,
+        action_write_lock,
         task_vars=task_vars
     )