lib/testing: Execute tests in separate namespaces

We moved the libxdp tests to separate namespaces, but not the tool tests. Let's
move the tool tests as well, since they also mess with namespace setups, so it's
better to make sure they don't interfere with the rest of the system.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>

lib/testing/test_runner.sh

@@ -580,6 +580,11 @@ if [ "$EUID" -ne "0" ]; then
     else
         die "Tests should be run as root"
     fi
+else
+    if [ "${DID_UNSHARE:-0}" -ne "1" ]; then
+        echo "    Executing tests in separate net- and mount namespaces" >&2
+        exec env DID_UNSHARE=1 unshare -n -m "$0" "$@"
+    fi
 fi
 
 export XDP_FILTER