Install ryu's requirements

Install packages ryu requires explicitly becuase they are
no longer covered by neutron's requirements.
(They used to be until very recently.)

Closes-Bug: #1323136
Change-Id: I6a603d95c053ac1deba59d8e479dbaf1a70293f3
PKIZ is the default token provider

Keystone changed the default token provider to PKIZ from PKI.

Change-Id: I56b975383ded450308a8fe01908b6e5549e7cd74
Use correct path when extracting tar.gz image

Fix issue with file:/ image urls.

Change-Id: I8c5f5b27b5d6ebe5be84dc58d37752adbd12f89b
Closes-Bug: 1277609
Merge "Use correct path when extracting tar.gz image"
Merge "Install ryu's requirements"
Merge "PKIZ is the default token provider"