pgAgent commit: Add a simple regression test.

Add a simple regression test.
Original work by Christoph Berg, with updates by me to make it work on
macOS which doesn't have a "timeout" command and to cleanup some issues
with line endings in the expected output files.

Branch
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master

Details
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https://git.postgresql.org/gitweb?p=pgagent.git;a=commitdiff;h=8b7ec040d4b837593c94fa6149bec0a77b95ad64

Modified Files
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.gitignore             |  7 ++++++-
README                 | 10 ++++++++++
test/Makefile          |  4 ++++
test/expected/init.out |  1 +
test/expected/job.out  | 23 +++++++++++++++++++++++
test/sql/init.sql      |  1 +
test/sql/job.sql       | 18 ++++++++++++++++++
7 files changed, 63 insertions(+), 1 deletion(-)