Use pg_class instead of gp_segment_configuration to test Entry.

[avamingli]

Commit 371fc97 ignore cases related to external_fts.
As we have external_fts CI now, recover the test case.

To avoid copying large unnecessary cases for just one or several case using gp_segment_configuration, use pg_class to test Entry locus.

When external_fts is on Seq scan on
gp_segment_configuration would be replaced by
Function Scan on gp_get_segment_configuration
Inconsistence between CIs will cause such cases to fail.

Authored-by: Zhang Mingli avamingli@gmail.com

fix #ISSUE_Number

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[avamingli]

pg_upgrade failed once again #262

Failure, exiting

real	0m0.156s
user	0m0.023s
sys	0m0.041s
ERROR: Failure encountered in upgrading qd node
/code/gpdb_src/src/bin/pg_upgrade /code/gpdb_src/src/bin/pg_upgrade/tmp_check/upgrade/qd /code/gpdb_src/src/bin/pg_upgrade
make[1]: *** [Makefile:78: check] Error 1
make: *** [GNUmakefile:198: installcheck-world-src/bin/pg_upgrade-recurse] Error 2
make: Target 'installcheck-world' not remade because of errors.
Error: Process completed with exit code 1.

[avamingli]

Pushed, thanks for reviewing.