Forcibly upgrade/install pecan-dev for OpenStack gating tests.

Change-Id: I73cdf6ecedfb8b636ddd90aca473b8b786c50d7d
Cleanup the WSGI app reference from the threadlocal state on every request.

Change-Id: I22f93224047e2b6fd6692423cc27f85b6261f9f8
Closes-Bug: #1279461
Fix a trailing slash bug for `RestController`s that have a `_lookup` method.

Change-Id: Ibd025fc52d37f58644de23cf283afd8d4d55e2d1
Closes-Bug: #1280003
Test pecan against Python3.4 (for now, rc1).

Change-Id: I39c03bbca6c54a3d6c75f82da9842d67ed5666ea
Merge "Cleanup the WSGI app reference from the threadlocal state on every request."
Merge "Test pecan against Python3.4 (for now, rc1)."