3.0.0 policy-handler - migrated to python 3.6

- migrated from python 2.7 to 3.6
- brought up the latest versions of dependencies
  -- Cherrypy 15.0.0, requests 2.18.4, websocket-client 0.48.0
- fixed migration errors
  -- renamed the standard package Queue to queue
  -- dict.items() instead of dict.iteritems()
  -- dict.keys() instead of dict.viewkeys()
  -- range() instead of xrange()
  -- subprocess.check_output(..., universal_newlines=True) to
     get str instead of byte-stream from stdout
- cleaned up migration warnings
  -- super() instead of super(A, self)
  -- logger.warning() instead of .warn()
- moved main() from policy_handler.py to __main__.py
- getting the policy_handler version directly from setup.py
  instead of the env var on init of the audit

Change-Id: I0fc4ddc51c08a64f3cfdc5d2f010b1c6a1ae92f0
Signed-off-by: Alex Shatov <alexs@att.com>
Issue-ID: DCAEGEN2-515
diff --git a/requirements.txt b/requirements.txt
index 4c694d0..b6696ea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
-CherryPy>=10.2.2,<11.0
+CherryPy>=15.0.0,<16.0.0
 enum34>=1.1.6
 psutil>=5.4.5,<6.0.0
-requests>=2.13.0,<3.0.0
-websocket-client>=0.40.0,<1.0.0
+requests>=2.18.4,<3.0.0
+websocket-client>=0.48.0,<1.0.0