Remove unused package in requirement.txt
Remove unused package in requirement.txt

This patch is similar to https://bugs.launchpad.net/glance/+bug/1252344.

Currently wsgiref/passlib package exist in requirement.txt,
but I confirmed that they are unused in glance source by "grep" command.

I removed them to clean up.

Closes-bug: #1255826
Change-Id: Ibbc2f1d413efacd0c18ba16c9250ef08470667d1

redhat-openstack/glance,jumpstarter-io/glance,takeshineshiro/glance,scripnichenko/glance,tanglei528/glance,vuntz/glance,dims/glance,klmitch/glance,klmitch/glance,scripnichenko/glance,dims/glance,saeki-masaki/glance,sigmavirus24/glance,openstack/glance,JioCloud/glance,wkoathp/glance,stevelle/glance,paramite/glance,openstack/glance,kfwang/Glance-OVA-OVF,paramite/glance,ozamiatin/glance,akash1808/glance,stevelle/glance,rajalokan/glance,rajalokan/glance,darren-wang/gl,vuntz/glance,redhat-openstack/glance,wkoathp/glance,JioCloud/glance,saeki-masaki/glance,openstack/glance,tanglei528/glance,sigmavirus24/glance,darren-wang/gl,takeshineshiro/glance,jumpstarter-io/glance,ozamiatin/glance,kfwang/Glance-OVA-OVF,akash1808/glance