Don't gate on E125

E125 overreaches on what pep8 specifies. See
https://github.com/jcrocholl/pep8/issues/126

In practice E125 can be a pain as compliance requires
manual indenting if using emacs and refactoring tools
don't always get it right.

There's a bit of a discussion about it here (on a tempest
changeset):

https://review.openstack.org/#/c/36788/

Change-Id: Ic73ab3c4a47f33de9145e0c7db2d8674230c2fe0
Merge "Don't gate on E125"