Redefine swift configs in SWIFT_DIR

We still need a link in /etc/swift until #885595 is fixed.
diff --git a/files/swift/swift-remakerings b/files/swift/swift-remakerings
index 9343783..c65353c 100755
--- a/files/swift/swift-remakerings
+++ b/files/swift/swift-remakerings
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-cd /etc/swift
+cd %SWIFT_CONFIG_LOCATION%
 
 rm -f *.builder *.ring.gz backups/*.builder backups/*.ring.gz