Add ex_revoke_security_group_ingress method to the CloudStack driver and
a work-around for a nasty inconsistency bug in CloudStack.
Sort values in RECORD_TYPE_MAP.

Having the values sorted makes it easier to spot duplicate.

Closes #270

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
flake8's --exclude flag doesn't like /

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Fix for PEP8's E265.

pep8 1.5 introduced a new test (E265) to ensure there's at least one
space before block comment.

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Fix PEP8's E713 and E714.

Two new tests were introduced with pep8 1.5 to report when operators
'not in' and 'is not' are recommended.

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Fix for various PEP8 errors.

Fix some visual alignments errors reported by pep8.

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Add support for Google DNS API.

Google recently added a new API for DNS management. This new driver
implement simple operations to create and view zones and records.