profitbricks-build7-amd64 has 8 gigs of RAM and 2 cores, so might as well
use them!
echo "boot_timeout = 1200" >> $WORKSPACE/makebuildserver.config.py
echo "apt_package_cache = True" >> $WORKSPACE/makebuildserver.config.py
echo "copy_caches_from_host = True" >> $WORKSPACE/makebuildserver.config.py
+echo "memory = 6144" >> $WORKSPACE/makebuildserver.config.py
+echo "cpus = 2" >> $WORKSPACE/makebuildserver.config.py
./makebuildserver -vv --clean
if [ -z "`vagrant box list | egrep '^buildserver\s+\((libvirt|virtualbox), [0-9]+\)$'`" ]; then