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

lib/ansible/playbook/play_context.py

@@ -80,6 +80,7 @@ MAGIC_VARIABLE_MAPPING = dict(
    su_exe           = ('ansible_su_exe',),
    su_flags         = ('ansible_su_flags',),
    executable       = ('ansible_shell_executable',),
+   module_compression = ('ansible_module_compression',),
 )
 
 SU_PROMPT_LOCALIZATIONS = [
@@ -169,6 +170,7 @@ class PlayContext(Base):
     _accelerate_ipv6  = FieldAttribute(isa='bool', default=False, always_post_validate=True)
     _accelerate_port  = FieldAttribute(isa='int', default=C.ACCELERATE_PORT, always_post_validate=True)
     _executable       = FieldAttribute(isa='string', default=C.DEFAULT_EXECUTABLE)
+    _module_compression = FieldAttribute(isa='string', default=C.DEFAULT_MODULE_COMPRESSION)
 
     # privilege escalation fields
     _become           = FieldAttribute(isa='bool')