Revert "Stop duplicating the configuration"

This reverts commit 17b2c7ab42 (it was
causing regressions in stable because older stack.sh did not create
the config and relied on this).

Change-Id: I55251b80aeb176f18ce155d87c496f2e5942681f

devstack-vm-gate.sh

@@ -157,6 +157,9 @@ else
 fi
 
 if [ "$DEVSTACK_GATE_TEMPEST" -eq "1" ]; then
+    echo "Configuring tempest"
+    cd $BASE/new/devstack
+    sudo -H -u stack ./tools/configure_tempest.sh
     cd $BASE/new/tempest
     echo "Running tempest smoke tests"
     sudo -H -u stack NOSE_XUNIT_FILE=nosetests-smoke.xml nosetests --with-xunit -sv --nologcapture --attr=type=smoke tempest