docstring fix

The docstring of class Extended_availability_zone was totally same as
Extended_server_attributes. This patch improves this docstring.

Change-Id: Ifd59d8dd149975c7f2653a0e0effadfc88d119d4
Fix string formatting of exception.NoUniqueMatch message

There is no implicit logger string formatting happening, so
we need to do this on our own.

Change-Id: I13dfb804d55b5ede2987e355f8a932f237b56c56
Fix the test parameter order for v3 evacuate test

On assertEqual(), the order of parameters should be "expected" and
"observed". However the parameters of some evacuate tests are invalid.
This patch fixes them.

Change-Id: I7ee48ef87082301f7f4ea0633b39275847cbd7e1
Sync unhandled exception logging change from Oslo

Copying changes from 1 Oslo commit: Ibf00173a07510b2ec0c81a29624004f17810a4e4
This is related to the bug fix for adding error type to unhandled
exception log message.

Change-Id: Ie8af57a148753121f79136af928feb0edaea228b
Closes-Bug: #1265561
Merge "Fix the test parameter order for v3 evacuate test"
Merge "Sync unhandled exception logging change from Oslo"
Merge "Fix string formatting of exception.NoUniqueMatch message"
Merge "docstring fix"