Specify requests==2.11.1 in the undercloud venv
Specify requests==2.11.1 in the undercloud venv

We got an issues with the recent requests release,
so try use the prev version.

Change-Id: I83603a1a9bc3aa280adb17a6bb49b5da2b5127ab

okolisny/InfraRed,redhat-openstack/infrared,okolisny/InfraRed,redhat-openstack/infrared,redhat-openstack/infrared,okolisny/InfraRed