use openhtc.io aliases when using DIRECT proxies

Author: DrDaveD

config-osg.opensciencegrid.org.conf

@@ -1 +1,6 @@
-CVMFS_SERVER_URL="http://cvmfs-s1bnl.opensciencegrid.org:8000/cvmfs/@fqrn@;http://cvmfs-s1fnal.opensciencegrid.org:8000/cvmfs/@fqrn@;http://cvmfs-s1goc.opensciencegrid.org:8000/cvmfs/@fqrn@"
+if [ "$CVMFS_HTTP_PROXY" = "DIRECT" ] || [ "$CVMFS_HTTP_PROXY" = "auto;DIRECT" ]; then
+    CVMFS_SERVER_URL="http://s1bnl-cvmfs.openhtc.io/cvmfs/@fqrn@;http://s1fnal-cvmfs.openhtc.io/cvmfs/@fqrn@;http://s1osggoc-cvmfs.openhtc.io/cvmfs/@fqrn@"
+    CVMFS_FALLBACK_PROXY=""
+else
+    CVMFS_SERVER_URL="http://cvmfs-s1bnl.opensciencegrid.org:8000/cvmfs/@fqrn@;http://cvmfs-s1fnal.opensciencegrid.org:8000/cvmfs/@fqrn@;http://cvmfs-s1goc.opensciencegrid.org:8000/cvmfs/@fqrn@"
+fi