Add PGXS options to control TAP and isolation tests

The following options are added for extensions:
- TAP_TESTS, to allow an extention to run TAP tests which are the ones
present in t/*.pl.  A subset of tests can always be run with the
existing PROVE_TESTS for developers.
- ISOLATION, to define a list of isolation tests.
- ISOLATION_OPTS, to pass custom options to isolation_tester.

A couple of custom Makefile targets have been accumulated across the
tree to cover the lack of facility in PGXS for a couple of releases when
using those test suites, which are all now replaced with the new flags,
without reducing the test coverage.  This also fixes an issue with
contrib/bloom/, which had a custom target to trigger its TAP tests of
its own not part of the main check runs.

Author: Michael Paquier
Reviewed-by: Adam Berlin, Álvaro Herrera, Tom Lane, Nikolay Shaplov,
Arthur Zakirov
Discussion: https://postgr.es/m/20180906014849.GG2726@paquier.xyz

src/makefiles/pgxs.mk

@@ -46,6 +46,9 @@
 #   HEADERS_built_$(MODULE) -- as above but built first (also NOT cleaned)
 #   REGRESS -- list of regression test cases (without suffix)
 #   REGRESS_OPTS -- additional switches to pass to pg_regress
+#   TAP_TESTS -- switch to enable TAP tests
+#   ISOLATION -- list of isolation test cases
+#   ISOLATION_OPTS -- additional switches to pass to pg_isolation_regress
 #   NO_INSTALLCHECK -- don't define an installcheck target, useful e.g. if
 #     tests require special configuration, or don't use pg_regress
 #   EXTRA_CLEAN -- extra files to remove in 'make clean'
@@ -349,6 +352,12 @@ ifeq ($(PORTNAME), win)
 	rm -f regress.def
 endif
 endif # REGRESS
+ifdef TAP_TESTS
+	rm -rf tmp_check/
+endif
+ifdef ISOLATION
+	rm -rf output_iso/ tmp_check_iso/
+endif
 
 ifdef MODULE_big
 clean: clean-lib
@@ -383,28 +392,47 @@ $(test_files_build): $(abs_builddir)/%: $(srcdir)/%
 	$(MKDIR_P) $(dir $@)
 	ln -s $< $@
 endif # VPATH
+endif # REGRESS
 
 .PHONY: submake
 submake:
 ifndef PGXS
 	$(MAKE) -C $(top_builddir)/src/test/regress pg_regress$(X)
+	$(MAKE) -C $(top_builddir)/src/test/isolation all
 endif
 
-# against installed postmaster
+# Standard rules to run regression tests including multiple test suites.
+# Runs against an installed postmaster
 ifndef NO_INSTALLCHECK
 installcheck: submake $(REGRESS_PREP)
+ifdef REGRESS
 	$(pg_regress_installcheck) $(REGRESS_OPTS) $(REGRESS)
 endif
+ifdef ISOLATION
+	$(pg_isolation_regress_installcheck) $(ISOLATION_OPTS) $(ISOLATION)
+endif
+ifdef TAP_TESTS
+	$(prove_installcheck)
+endif
+endif # NO_INSTALLCHECK
 
+# Runs independently of any installation
 ifdef PGXS
 check:
 	@echo '"$(MAKE) check" is not supported.'
 	@echo 'Do "$(MAKE) install", then "$(MAKE) installcheck" instead.'
 else
 check: submake $(REGRESS_PREP)
+ifdef REGRESS
 	$(pg_regress_check) $(REGRESS_OPTS) $(REGRESS)
 endif
-endif # REGRESS
+ifdef ISOLATION
+	$(pg_isolation_regress_check) $(ISOLATION_OPTS) $(ISOLATION)
+endif
+ifdef TAP_TESTS
+	$(prove_check)
+endif
+endif # PGXS
 
 ifndef NO_TEMP_INSTALL
 temp-install: EXTRA_INSTALL+=$(subdir)