Revert "[swift] python-pluggy-0.3.1 is required for rhos14"
Revert "[swift] python-pluggy-0.3.1 is required for rhos14"

no need to have explicit reference to python-pluggy-0.3.1.
it will be installed as a dependence required by python-tox-1.8.1. Just build 1.8.1 on 

https://copr.fedorainfracloud.org/coprs/abregman/el7-rhos14-test-deps/builds/ 


This reverts commit 338765a8489f3cdfb962f95fcd96081684cacbbf.

Change-Id: I27cc034d5777284337f5afcdd7f9cf0a3db469c6

redhat-openstack/octario,redhat-openstack/octario