run swift blocks if any services are enabled

Previously the swift blocks only ran if s-proxy is enabled, which
prevents a multinode configuration. We should run these blocks if any
swift services are enabled, and push proxy specific conditionals one
step lower.

Change-Id: I540a97615b3c19f882c8673b1a4a29cd47e36aa8
diff --git a/stack.sh b/stack.sh
index 5c16f04..84eefd2 100755
--- a/stack.sh
+++ b/stack.sh
@@ -799,7 +799,7 @@
     fi
 fi
 
-if is_service_enabled s-proxy; then
+if is_service_enabled swift; then
     if is_service_enabled ceilometer; then
         install_ceilometermiddleware
     fi
@@ -1118,7 +1118,7 @@
 # Storage Service
 # ---------------
 
-if is_service_enabled s-proxy; then
+if is_service_enabled swift; then
     echo_summary "Configuring Swift"
     init_swift
 fi
@@ -1172,7 +1172,7 @@
 # Only run the services specified in ``ENABLED_SERVICES``
 
 # Launch Swift Services
-if is_service_enabled s-proxy; then
+if is_service_enabled swift; then
     echo_summary "Starting Swift"
     start_swift
 fi