Update fullstack Vagrantfile for Euc 1rc1

vagrant/release/fullstack/Vagrantfile

@@ -9,6 +9,12 @@ CPU_COUNT = 2
 # to a name and a file path, which are used for retrieving
 # a Vagrant box from the internet.
 openedx_releases = {
+  "open-release/eucalyptus/master" => {
+    :name => "eucalyptus-fullstack-1rc1", :file => "eucalyptus-fullstack-2016-07-22.box",
+  },
+  "open-release/eucalyptus/1rc1" => {
+    :name => "eucalyptus-fullstack-1rc1", :file => "eucalyptus-fullstack-2016-07-22.box",
+  },
   # Note: the devstack and fullstack boxes differ, because devstack had an issue
   # that needed fixing, but it didn't affect fullstack.
   "named-release/dogwood" => {