[INTERNAL] FileSubmitter now decides where to store tmp. files

Change-Id: If5568f6e9dec2456f13f57f252b0f2b16a3ec802
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1663
Reviewed-by: Franz Zieris <zieris@inf.fu-berlin.de>
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>