[PAS] update inventory to .lib.princeton.edu domain

Previously, I was getting the error:

fatal: [slavery-staging1.princeton.edu]: UNREACHABLE! => {"changed": false, "msg": "Data could not be sent to remote host \"slavery-staging1.princeton.edu\". Make sure this host can be reached over ssh: ssh: Could not resolve hostname slavery-staging1.princeton.edu: nodename nor servname provided, or not known\r\n", "unreachable": true}

inventory/all_projects/pas

@@ -1,8 +1,8 @@
 [pas_production]
 slavery-prod1.princeton.edu
 [pas_staging]
-slavery-staging1.princeton.edu
+slavery-staging1.lib.princeton.edu
 # slavery-staging2.princeton.edu
 [pas_staging_upgrade]
 slavery-staging-upgrade1.lib.princeton.edu
-slavery-staging-upgrade2.lib.princeton.edu
+slavery-staging-upgrade2.lib.princeton.edu