add pathman update checker utilities

Author: funbringer

tests/update/README.md

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+## pg_pathman's update checker
+
+It's necessary to check that `ALTER EXTENSION pg_pathman UPDATE` produces an SQL frontend that is exactly the same as a fresh install.
+
+Usage:
+
+```bash
+PG_CONFIG=... ./dump_pathman_objects %DBNAME%
+
+diff file_1 file_2
+```

tests/update/dump_pathman_objects

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+#!/usr/bin/bash
+
+
+rndstr=$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 13 ; echo '')
+bindir=$($PG_CONFIG --bindir)
+dbname=$1
+flname=pathman_objects_$rndstr.txt
+
+# show file name
+echo $flname
+
+$bindir/psql $dbname << EOF
+
+\o $flname
+
+SELECT pg_get_functiondef(objid)
+FROM pg_catalog.pg_depend JOIN pg_proc ON pg_proc.oid = pg_depend.objid
+WHERE refclassid = 'pg_catalog.pg_extension'::REGCLASS AND
+          refobjid = (SELECT oid
+                                  FROM pg_catalog.pg_extension
+                                  WHERE extname = 'pg_pathman') AND
+          deptype = 'e'
+ORDER BY objid::regprocedure::TEXT ASC;
+
+\d+ pathman_config
+\d+ pathman_config_params
+\d+ pathman_partition_list
+\d+ pathman_cache_stats
+\d+ pathman_concurrent_part_tasks
+
+EOF