Fix BOOTSTRAP_OPTS

BOOTSTRAP_OPTS was surrounded by " ", which meant it would evaluate to:
-e 'BOOTSTRAP_OPTS', this became problematic if you wanted to add more
than one value.

By removing the " " this is resolved.

Change-Id: I1351fddbdfd09f0a1a5eeef4afb44679bd39cd63

scripts/bootstrap-aio.sh

@@ -35,7 +35,7 @@ pushd tests
   else
     /opt/ansible-runtime/bin/ansible-playbook bootstrap-aio.yml \
                      -i test-inventory.ini \
-                     -e "${BOOTSTRAP_OPTS}"
+                     -e ${BOOTSTRAP_OPTS}
   fi
 popd