testtwarm: reenable install and settings appending
They were disabled during testing phase. We now really want to do the
checkouts installation since testswarm is in preproduction.
Gerrit commit: 4a912cd53b5b1ac52e9e2748cb99aef458a2e643
Change-Id: I96b484c2606ca8cc23856442cd9a6bf9772eb71b |