Run controllers in parallel

Closes-Bug: #1310494

Ported patch from Lukasz: https://github.com/loles/fuel-web/commit/88391c44c192de06c14e4c26a6f195a5750a6b90

Change-Id: I0281057e7416ebe835946c09129d3327accea3fb
Merge "Run controllers in parallel"