Add support to list compute extensions

Since novaclient has support to list extensions, we should add
some of the logic to our list extensions command.

Closes-Bug: #1337684
Change-Id: I3074225780142df265a34add03e60c0f7c64c711
Python 3: remove a useless code to safe_encode()

The safe_encode method returns bytes, so we cannot concatenate its output with
text strings. This call does not seem needed after all, so let's just remove
it.

Change-Id: I6c18427559147d4c732ff7daa6d6006e7e5f6365
Add support to list volume extensions

Since cinderclient has support to list extensions, we should add
some of the logic to our list extensions command.

Change-Id: I7dc7ca325ea9b82194bba6d875e7b8dc1884d77e
Closes-Bug: #1337687
Catch SystemExit for parse args

If you have a test with parse args it fails with no error
messages.  This change throws an exception.

Change-Id: I545aba346620a352fe570d394dbd4d6bd2daa995
Allow network find to use alternate name

Add the name_attr to the network find method so it can search
for things like floating_ip_address for floating IP addresses
rather than just id.

Change-Id: I827e3745b06397a54555d1286e477bf2e05bf789
Python 3: do not compare a list to a zip object

In Python 3, zip() returns a zip object, not a list.

Change-Id: I1a472bec3e12b5ae3c3555cf690b99a57579ce83
Domain administrator cannot do project operations

Domain administrator cannot do project operations because the
require access to the domain API (which they don't have).  When
attempting to find a domain for project operations, ignore errors
because the API returns nothing without indicating there is a
problem.  The domain administrators will have to use a domain id,
but they will still be able to do project operations.  If the user
does not have permission to read the domain table, they cannot
use domain names.

Change-Id: Ieed5d420022a407c8296a0bb3569d9469c89d752
Closes-Bug: #1317478
Closes-Bug: #1317485
Merge "Python 3: do not compare a list to a zip object"
Merge "Python 3: remove a useless code to safe_encode()"
Merge "Add support to list compute extensions"
Merge "Clean up make_client() logging"
Merge "Catch SystemExit for parse args"
Merge "Allow network find to use alternate name"
Merge "Add support to list volume extensions"
Merge "Domain administrator cannot do project operations"
Merge branch 'timing' into dt-test
Merge branch 'compute-test-fix' into dt-test
Merge branch 'help-cleanup' into dt-test