Re: no test programs in contrib

Here's a patch. This creates a new subdir src/test/modules and places
the five initially proposed modules in there. They continue to have
their makefile with the same ifdef USE_PGXS pattern; they are no longer
installed by default.

Because many of them had either "test" in their names or some other
now-useless particle, I renamed them:

worker_spi -> bgworker
test_decoding -> logical_decoding
dummy_seclabel -> seclabel
test_shm_mq -> shm_mq
test_parser -> tsparser

The renaming is not complete: the extensions continue to have the old
names, for instance. If the consensus is to rename them completely I
can finish that, or we can decide to keep the original names, but they
all seem inappropriate to me.

I haven't done anything about documentation. I thought a new chapter
after "Additional Supplied Modules", perhaps entitled "Additional Sample
Modules" would be appropriate.

I tweaked make targets check, installcheck, installcheck-world,
check-world: they all run the additional tests now. For buildfarm, the
client code will need to be updated to have a new stage for
src/test/modules running "make check".

I haven't touched MSVC yet.

Opinions on this approach please?

--
Álvaro Herrera http://www.2ndQuadrant.com/
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