Replace try...except with assertRaises

Even the exception was not raised, try...except... still can pass the
test cases. So change to assertRaises.

Change-Id: Idec096d66fe8019cfa009dfa12e36bd4827485ad
Don't use request builtin redirect for any methods

Since Iee578ea23c842e48f2d73992804f9c2efb9c7f43 has been merged we
really don't need to use requests buggy redirect so let just do that to
have the element of less surprise.

Change-Id: Ie363edc3f21274a075f3e7363b78ece1b511d193
Fixed incorrect indentation in the tests

Change-Id: I8900ac8542a9a0fd3ea41a8031eb66e79cefecd6
Improve help strings

Follow oslo.config style guide for help strings better to create
consistent help strings:
* Finish help strings with "."
* Fix capitalization in one example
* Fix wording (use "by a semicolon")

Change-Id: I402401509481ce18bac333cd6d96554d64725b57
Updated from global requirements

Change-Id: I6d8caee156dffec94a4e01d87e5d6ceed19bb5ea
Merge "Don't use request builtin redirect for any methods"
Merge "Improve help strings"
Merge "Fixed incorrect indentation in the tests"
Merge "Replace try...except with assertRaises"