bench-all: get working again

Fix gem5/build wrong path for dd swapfile. Put it under out/ while we are at it
now that we have out of tree builds.

Allow seq_id larger than 7: broke previously because 08 is not valid octal.

Use timeout --foreground to allow killing scons

Don't upload results by default, too insane.

gem5/build

@@ -3,7 +3,7 @@ set -eu
 arch=x86_64
 cross_compile=
 j=
-outdir=./
+outdir="$(pwd)/out"
 while getopts a:c:j:o: OPT; do
   case "$OPT" in
     a)