Remove redudant sourcing of stackrc
Remove redudant sourcing of stackrc

Commit 2f0fd969ff6b6aae654fc038695f8736f7b877a6 added another
sourcing of stackrc in a cleaner place but did not remove the one
that followed a few lines later.

Change-Id: I4ddbdc5f3fec38f317e9b7cf5fa5ed6e29bfa134

dtroyer/grenade,dtroyer/grenade,openstack-dev/grenade,openstack-dev/grenade