Ziploader

* Ziploader proof of concept (jimi-c)

* Cleanups to proof of concept ziploader branch:

* python3 compatible base64 encoding
* zipfile compression (still need to enable toggling this off for
  systems without zlib support in python)
* Allow non-wildcard imports (still need to make this recusrsive so that
  we can have module_utils code that imports other module_utils code.)
* Better tracebacks: module filename is kept and module_utils directory
  is kept so that tracebacks show the real filenames that the errors
  appear in.

* Make sure we import modules that are used into the module_utils files that they are used in.

* Set ansible version in a more pythonic way for ziploader than we were doing in module replacer

* Make it possible to set the module compression as an inventory var

This may be necessary on systems where python has been compiled without
zlib compression.

* Refactoring of module_common code:

* module replacer only replaces values that make sense for that type of
  file (example: don't attempt to replace python imports if we're in
  a powershell module).
* Implement configurable shebang support for ziploader wrapper
* Implement client-side constants (for SELINUX_SPECIAL_FS and SYSLOG)
  via environment variable.
* Remove strip_comments param as we're never going to use it (ruins line
  numbering)

* Don't repeat ourselves about detecting REPLACER

* Add an easy way to debug

* Port test-module to the ziploader-aware modify_module()

* strip comments and blank lines from the wrapper so we send less over the wire.

* Comments cleanup

* Remember to output write the module line itself in powershell modules

* for line in lines strips the newlines so we have to add them back in

test/units/module_utils/basic/test_exit_json.py

@@ -39,6 +39,7 @@ class TestAnsibleModuleExitJson(unittest.TestCase):
     def setUp(self):
         self.COMPLEX_ARGS = basic.MODULE_COMPLEX_ARGS
         basic.MODULE_COMPLEX_ARGS = '{}'
+        basic.MODULE_CONSTANTS = '{}'
 
         self.old_stdout = sys.stdout
         self.fake_stream = BytesIO()
@@ -129,6 +130,7 @@ class TestAnsibleModuleExitValuesRemoved(unittest.TestCase):
         for args, return_val, expected in self.dataset:
             sys.stdout = BytesIO()
             basic.MODULE_COMPLEX_ARGS = json.dumps(args)
+            basic.MODULE_CONSTANTS = '{}'
             module = basic.AnsibleModule(
                 argument_spec = dict(
                     username=dict(),
@@ -148,6 +150,7 @@ class TestAnsibleModuleExitValuesRemoved(unittest.TestCase):
             expected['failed'] = True
             sys.stdout = BytesIO()
             basic.MODULE_COMPLEX_ARGS = json.dumps(args)
+            basic.MODULE_CONSTANTS = '{}'
             module = basic.AnsibleModule(
                 argument_spec = dict(
                     username=dict(),