Use the Automake "parallel-tests" driver, albeit in non-parallel mode

This seems perverse, but it means we invoke tests in the same way
I want to use for other Telepathy projects, which will help when
we want to merge their source trees together.

Now that we can rely on having the parallel-tests setup, we can use
AM_TESTS_ENVIRONMENT instead of TESTS_ENVIRONMENT (which is now
reserved for the user, like CFLAGS), and we must use LOG_COMPILER
rather than TESTS_ENVIRONMENT for "adverb" command prefixes.

We no longer need to use test-wrapper.sh for the tests, because
Automake has similar functionality built-in. On a buildbot
or similar, use "make check VERBOSE=1" to cat the logs automatically.

(cherry picked from commit 09ff23c267f2b90576cb79c8d3187eda6cb435c8)

Reviewed-by: Guillaume Desmottes <guillaume.desmottes@collabora.co.uk>
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=71100

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