message: fix path to the test apps
diff: # do not use this script
  # it is written only for internal tests via Travis CI
  -TDIR=build/local_prefix/work/hermit/x86_64-hermit/extra
  +TDIR=build/local_prefix/opt/hermit/x86_64-hermit/extra
  FILES="$TDIR/tests/hello $TDIR/tests/hellof $TDIR/tests/hello++ $TDIR/tests/thr_hello $TDIR/tests/pi $TDIR/benchmarks/stream $TDIR/benchmarks/basic $TDIR/tests/signals $TDIR/tests/test-malloc"
  -PROXY=build/local_prefix/work/hermit/bin/proxy
  +PROXY=build/local_prefix/opt/hermit/bin/proxy
  #for f in $FILES; do echo "check $f..."; HERMIT_ISLE=qemu HERMIT_CPUS=1 HERMIT_VERBOSE=1 timeout --kill-after=5m 5m $PROXY $f || exit 1; done
  pwd
  ls -la build/local_prefix/
  -ls -la build/local_prefix/work/
  -ls -la build/local_prefix/work/hermit/
  +ls -la build/local_prefix/opt/
  +ls -la build/local_prefix/opt/hermit/
  ls -la $TDIR
  # test echo server at port 8000
  HERMIT_ISLE=qemu HERMIT_CPUS=1 HERMIT_VERBOSE=1 HERMIT_APP_PORT=8000 $PROXY $TDIR/tests/server &
  