libpq: Add TAP test for nested service fileHEADmaster

This test corresponds to the case of a "service" defined in a service
file, that libpq is not able to support in parseServiceFile().

This has come up during the review of a patch to add more features in
this area, useful on its own.  Piece extracted from a larger patch by
the same author.

Author: Ryo Kanbayashi <[email protected]>
Discussion: https://postgr.es/m/[email protected]

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