Update 5.json with catalog changes (amgetmulti -> amgetbitmap)

To update 5.json, we ran:

cat src/include/catalog/*.h | perl src/backend/catalog/process_foreign_keys.pl > gpMgmt/bin/gppylib/data/5.json
Signed-off-by: NJacob Champion <pchampion@pivotal.io>

gpMgmt/bin/gppylib/data/5.json

 {
    "__comment" : "Generated by process_foreign_keys.pl",
-   "__info" : { "CATALOG_VERSION_NO" : "301705051" },
+   "__info" : { "CATALOG_VERSION_NO" : "301709131" },
    "gp_distribution_policy" : {
       "foreign_keys" : [
          [ ["localoid"], "pg_class", ["oid"] ]
@@ -28,7 +28,7 @@
          [ ["aminsert"], "pg_proc", ["oid"] ],
          [ ["ambeginscan"], "pg_proc", ["oid"] ],
          [ ["amgettuple"], "pg_proc", ["oid"] ],
-         [ ["amgetmulti"], "pg_proc", ["oid"] ],
+         [ ["amgetbitmap"], "pg_proc", ["oid"] ],
          [ ["amrescan"], "pg_proc", ["oid"] ],
          [ ["amendscan"], "pg_proc", ["oid"] ],
          [ ["ammarkpos"], "pg_proc", ["oid"] ],