Syntax enhancements in some modules

[Victoria Martinez de la Cruz]

Two code syntax enhancements will help to reduce our technical debt

* Parentheses should not be used after certain keywords

Files affected/# of misuses per file

- validation.py/8
- generator.py/7
- memory.py/3
- helpers.py/3
- claims.py/3
- gettextutils.py/2 (this is in common)
- utils.py/2
- version.py/2
- catalogue.py/1
- test_messages.py/1
- test_messages.py/1
- base.py/1
- test_validation.py/1
- utils.py/1
- auth.py/1
- conductor.py/1
- observer.py/1
- backends.py/1
- fileutils.py /1
- utils.py/1
- pools.py/1
- claims.py/1
- log.py/1
- test_validation.py/1

* Collapsible "if" statements should be merged

- base.py/1
- generator.py/1

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/163223

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/163223
Committed: https://git.openstack.org/cgit/openstack/zaqar/commit/?id=f2ee58b00c6247302377755a1d9c83b676a09ee5
Submitter: Jenkins
Branch: master

commit f2ee58b00c6247302377755a1d9c83b676a09ee5
Author: Ricardo Ferreira <email address hidden>
Date: Tue Mar 10 23:18:09 2015 +0000

    Syntax enhancements

    Did some syntax improvement by:
    -Removing extraneous parentheses.
    -Collapsing "if" statements.
    -Used set literal notation.
    -Fixed pep8 issue

    Change-Id: I321536058a76bf69af1d6b38d37f81a07a2f7108
    Closes-Bug: #1397027