Fix shell hangs on checkconfig command when using http steps
Add sharedSession to prevent blocking session
Fix restart hang, close session at the end of the reactors
Merge branch 'github-master' into upstream-master

Conflicts:
	master/buildbot/steps/http.py
Merge branch 'github-master' into upstream-master

Conflicts:
	master/buildbot/steps/http.py
Merge branch 'upstream-master' of https://github.com/madazone/buildbot into upstream-master

Conflicts:
	master/buildbot/steps/http.py
Fix renderables paramters in HTTPStep
Merge branch 'master' into fix-httpstep-renderables
Revert to master branch version
Add httpstep test 'params' renderable
Fix renderables problem
Add a `BuildsetProperties` cache and seed from `addBuildset`

This diff adds a cache around the buildset properties table
accessed from `getBuildsetProperties` and seeds it from `addBuildset`,
to avoid extra DB accesses immediately after adding a buildset.
tiny fix in README; updates #2804
more README, updates #2804
whitespace. updates #2804
Fix missing inlineCallbacks on a test method
Merge andrewjcg/buildbot:cache_bsprops (PR #1152)

+autopep8
Merge madazone/buildbot:fix-httpstep-renderables (PR #1147)

+autopep8
Add relnotes
Fix failing libvirt test