Convert the encode/decode functions from oslo-incubator to use
oslo.utils encodeutils, as the incubator functions are now
deprecated.

Also syncs oslo-incubator to 62394a3 to purge usage of strutils
from the openstack/common modules.

Note includes oslo fix https://review.openstack.org/#/c/133290/
which we need or the python3 tests won't pass.

Change-Id: I630fe3f3ce14ae745a8417bfe6552acd31341c9c
Partial-Bug: #1380629

Synchronize the cliutils from oslo to heatclient and use
the common methods.

used common methods:
+arg
+env
+print_list

partially implements blueprint common-client-library-2

Change-Id: If79d58794257325a47b9938a172a87097fc93e1b

Module py3kcompat was removed from oslo-incubator, we can use
six directly.

* Sync commit of removing py3kcompat from oslo
* use six replace usage of py3kcompat

Change-Id: If0f9397588b2180fe198e804cbbb5b5c8420fe76
Closes-Bug: #1280033

In the process of unification of the clients code we should
reuse common functionality from Oslo.

Related to blueprint common-client-library-2

Change-Id: Ic19d3eb47b94acec4ed86e95b04ffe7cca0792dc

Current heatclient doesn't handle properly outgoing encode process.
For resolving it, this patch implements a process to encode everything
going out of the client, for example, prints.

This patch used two new modules (gettextutils.py and strutils.py)
taken from oslo-incubator in order to use safe_encode() and
safe_decode().

Closes-Bug: #1249233

Change-Id: Ia8c955a80d68126cd9c1fd791bda3e331a2aa5c9

Import urlutils for compatability issue
Remove obsolete code of Python 2.5 support

Partial implement: blueprint py33-support

Change-Id: I53515aa0f6f5c936e0d1a4f44b0ebf4998c59492

Fixes bug 1179007.

Change-Id: Ic3b99d88cb9c82112f1e2b51867a0da7fb6ec691