Build System: Enable python3 compatibility.

* Consistently use spaces in rest-api-templates/asterisk_processor.py.
* Exclude third-party from docs/full-en_US.xml.
* Add docs/full-en_US.xml to .gitignore.
* Use list() to convert python3 view.
* Use python3 print function.
* Replace cmp() with equivalent equation.
* Replace reference to out of scope subtype variable with name
  parameter.
* Use unescaping triple bracket notation in mustache templates where
  needed.  This causes behavior of Python2 to be maintained when using
  Python3.
* Fix references to has_websocket / is_websocket in
  res_ari_resource.c.mustache.
* Update calculation of has_websocket to use any().
* Use unicode mode for writing output file in transform.py.
* Replace 'from swagger_model import *' with explicit import of required
  symbols.

I have not tested spandspflow2pcap.py or voicemailpwcheck.py, only the
print syntax has been fixed.

Change-Id: If5c5b556a2800d41a3e2cfef080ac2e151178c33

rest-api-templates/make_ari_stubs.py

@@ -16,19 +16,20 @@
 # at the top of the source tree.
 #
 
+from __future__ import print_function
 import sys
 
 try:
     import pystache
 except ImportError:
-    print >> sys.stderr, "Pystache required. Please sudo pip install pystache."
+    print("Pystache required. Please sudo pip install pystache.", file=sys.stderr)
     sys.exit(1)
 
 import os.path
 
 from asterisk_processor import AsteriskProcessor
 from optparse import OptionParser
-from swagger_model import *
+from swagger_model import ResourceListing
 from transform import Transform
 
 TOPDIR = os.path.dirname(os.path.abspath(__file__))