No longer source undercloudrc

Since we no longer build the overcloud on top of the undercloud, we no
longer to source the undercloudrc, which is pointless since we're about
to exit when we source it.

Change-Id: If2eb1807694bab1b5d7e3ea77a9ef64f96a938b4

toci_devtest.sh

@@ -59,7 +59,6 @@ export no_proxy=${no_proxy:-},192.0.2.1
 source $TRIPLEO_ROOT/tripleo-incubator/seedrc
 if [ "undercloud" = "$TRIPLEO_TEST" ]; then
     devtest_undercloud.sh $TE_DATAFILE
-    source $TRIPLEO_ROOT/tripleo-incubator/undercloudrc
 fi
 if [ "overcloud" = "$TRIPLEO_TEST" ]; then
     # Register more nodes with the seed.