Fix various things so the functional tests will work under python3:

- A hashlib.md5() can only be update()d with an encoded string in py3.
- There's no dict.iteritems(), change to dict.items() (which is already
  an iterator).
- Open temp files with 'w+' mode rather than the default 'w+b' (as an
  alternative to encoding all the write and expected-read payloads as
  bytes).
- (This is a weird one) Explicitly raise SkipTest from unittest (rather
  than unittest2, which is where cls.skipException landed). Not sure why
  this is busted, but this moves the ball.

Conflict/issue with raising SkipTest on this branch.

(cherry picked from commit f1d742f32adeb662a3fdf8fa3ef3bc391e71ed81)
(cherry picked from commit b866202f54afddca66a77cd989b082e193a96956)

Includes squash of:
Before writing object data to stdout, re-open it in binary mode

Otherwise, you can hit TypeErrors on Python3.

Closes-Bug: 1775482
(cherry picked from commit 415b48056d9d021e04ec972029040a89a6b13928)

Conflicts:
    openstackclient/tests/functional/identity/v3/common.py

NOTE(melwitt): The conflicts are due to the following changes not in
Queens:

  Id8377363f7a3248b45aeeba21d2acc02684a0305
  I7c44bbb60557378b66c5c43a7ba917f40dc2b633

Change-Id: Ic9b2b47848a600e87a3674289ae7ae8c3e091fee
(cherry picked from commit 47f0277208362a3224f8e587bbdd60dd5aebf846)

VolumeBackupsRetore object has '_info' attribute
which contains the output data of the restore
command which should be returned instead of the
'VolumeBackupsRestore' object.

Change-Id: I64b75649c1ac9c24e05a197f7280975564b4d386
Story: 2004740
Task: 28811
(cherry picked from commit 24255ad0dde608a19d371a27c13714098097f185)
(cherry picked from commit 7882463fda77813c9e230373f0ab53c6c8574ba3)

Compute API version >= 2.37 requires a 'networks' value in
the server create request. The novaclient CLI defaults this
to 'auto' if not specified, but the novaclient ServerManager.create
python API binding code does not, as it wants clients to be explicit.

For the purposes of the OSC CLI, we should follow suit and if the
user is requesting OS_COMPUTE_API_VERSION>=2.37 without specific
nics, we should just default to 'auto'.

Change-Id: Ib760c55e31209223338a4086ff1f4fee88dc6959
Closes-Bug: #1750395
(cherry picked from commit 1008544882fbdae16b045abca05cf3e2e8a14787)
(cherry picked from commit 4944d4eaa9aaeffdee358680550ac7d7f0c6e8d8)

The code was calling an unexisting function which never existed.
The module refers now to the correct `InferenceRuleManager`. It
also allows the compatibility with the future python-keystoneclient
in which the compatibility method will be removed from the
RoleManager.

Conflicts:
    openstackclient/tests/unit/identity/v3/fakes.py

Backport note: Also changed the functional test test_implied_role_list
to expect 1 items instead of 3, in line with Queens expectations. The
additional 2 implied roles were only added during Rocky in Keystone
with Ie18a269e3d1075d955fe494acaf634a393c6bd7b.

Story: 2003877
Task: 26736

Change-Id: I08f785dc9e840da2e16915683eecfe49189c44b3
(cherry picked from commit 08dbd154e5da266e44f44386f711a3177e9061bd)

pycodestyle 2.40 and later enforce these rules that were not previously
enforced. Rather than just skipping them, this cleans up the trivial
instances of these violations.

This does also include some other updates that were not triggering errors
in an attempt to keep some of the style consistent.

Change-Id: Id7c0a6b8f1f835e69d844b000e3ed751852ada63
Closes-bug: #1762803
(cherry picked from commit d60141525987bc973802b4ec9a3b027e071d1966)

stable/queens allows SDK >=0.9.19 and <=0.11.3.  Somewhere in there the
return text of an exception changed.

Backport portions of Id6de1485bcafb41f238f3e74277094ce64a6acf4 to handle
this change, but modify to work with either text form sice both are allowed.

Change-Id: Ibfee8e1e2ae4eca763894bbee8747297e0fb350f

This commit makes to use stestr instead of ostestr
directly. ostestr>1.0.0 has started to use stestr instead of
testrepository. So there is no reason to use ostestr anymore.

Change-Id: I6327d50c9f6dd19f1de24b9b51532104fb3e916e