Mask out work_mem in auto_explain tests
Mask out work_mem in auto_explain tests

Commit 73ca7e7731917 (greenplum-db/gpdb#7195) introduced a simple suite
that exercises auto_explain. However, it went beyond a simple "EXPLAIN",
and instead it ran a muted version of EXPLAIN ANALYZE.

Comparing the output of "EXPLAIN ANALYZE" in a regress test is always
error-prone and flaky. To wit, commit 1348afc0054e3 (#7608) had to be
done shortly after 73ca7e7731917, because the feature was time
sensitive. More recently commit 2e4d99fa3f50e (#10032) was forced to
memorize the work_mem, likely compiled with --enable-cassert, and missed
the case when we were configured without asserts, failing the test with
a smaller-than-expected work_mem.

This commit puts a band aid on it by masking the numeric values of
work_mem in auto_explain output.

adam8157/gpdb,lisakowen/gpdb,adam8157/gpdb,jmcatamney/gpdb,lisakowen/gpdb,greenplum-db/gpdb,xinzweb/gpdb,adam8157/gpdb,xinzweb/gpdb,xinzweb/gpdb,50wu/gpdb,50wu/gpdb,50wu/gpdb,lisakowen/gpdb,50wu/gpdb,jmcatamney/gpdb,xinzweb/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,50wu/gpdb,adam8157/gpdb,xinzweb/gpdb,lisakowen/gpdb,jmcatamney/gpdb,50wu/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,xinzweb/gpdb,adam8157/gpdb,greenplum-db/gpdb,50wu/gpdb,jmcatamney/gpdb,adam8157/gpdb,greenplum-db/gpdb,adam8157/gpdb,lisakowen/gpdb,jmcatamney/gpdb,lisakowen/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,lisakowen/gpdb,lisakowen/gpdb,xinzweb/gpdb,adam8157/gpdb,50wu/gpdb,xinzweb/gpdb