Fix casing of xstatic-*

Although pip can technically handle package names case insensitively,
this is known to cause problems when using things like multiple packages
indexes.

Change-Id: I560b1d7a5885909b4d683e2ea0b38e75b536c38d
Drop greenio dependency

greenio dependency was added to add a new "greenio executor" to Oslo
Messaging, but I abandonned the changeset:
https://review.openstack.org/#/c/108652/

No OpenStack component use greenio.

Change-Id: I6a97e3b462f8d0985532384ea169ebee4c9b3c2d
Bump oslo.concurrency, as keystone is now importing oslo_concurrency

Change-Id: I62a58a41fa2485b199cd29836e2b1fb46632dab7
Merge "Fix casing of xstatic-*"
Merge "Bump oslo.concurrency, as keystone is now importing oslo_concurrency"
Update urllib>=1.8.3

Recent commit 969bfba931f132199662851c6f309be67761c4f9 in oslo.
vmware uses urllib3 connection api's that is available only
from 1.8.3.

This patch will unblock Minesweeper CI from failing in starting
up nova-compute.

Change-Id: I861724be09ede35ecedde7537e72610ec570dcb0
Merge "Update urllib>=1.8.3"
Merge "Drop greenio dependency"