Remove urllib3/requests from requirements
Remove urllib3/requests from requirements

This patch removes urrlib3 and requests from the requirements.txt
file so that the CentOS Ceph gate will pass.

At the moment, yum tries to install python-urllib3 and throws errors
when it finds that urrlib3 files already exist (since they were
installed via pip).

This also breaks our periodic builds which, in turn, makes infra
quite displeased.

Closes-Bug: 1715888
Change-Id: I2a8b0ebcca9839d033552130688356c055f71553

openstack/openstack-ansible,yanyao/openstack-ansible,stackforge/os-ansible-deployment,bunchc/openstack-ansible,yanyao/openstack-ansible,openstack/openstack-ansible,cfarquhar/openstack-ansible,stackforge/os-ansible-deployment,bunchc/openstack-ansible,cfarquhar/openstack-ansible