Add libpcre3-dev/pcre-devel to bindep.txt
Add libpcre3-dev/pcre-devel to bindep.txt

This is required to run "tox -edocs".

Change-Id: Iba9b5c660628bae77708911ef0459992e01c93c4
Closes-Bug: #1870205

openstack/glance,openstack/glance,openstack/glance