Fix python2.6 tests.
Fix python2.6 tests.

AssertIn is not supported, use assertTrue instead.

eduardomb/eve,stratosgear/eve,sebest/eve,kalbasit/eve,opticode/eve,matthieuprat/eve,julianhille/eve,jzorrof/eve,elpoisterio/eve,amagdas/eve,EasonYi/eve,hustlzp/eve,mugurrus/eve,kidaa/eve,superdesk/eve,bcrochet/eve,pjs7678/eve,yanyanqin/eve,mcreenan/eve