Remove vain attempts at fixing CI mongodb issues.
Remove vain attempts at fixing CI mongodb issues.

See https://github.com/travis-ci/travis-ci/issues/1967

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