pgsql: Add regression tests for remote execution of extension operators

Add regression tests for remote execution of extension operators/functions.

Rather than relying on other extensions to be available for installation,
let's just add some test objects to the postgres_fdw extension itself
within the regression script.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/b9f117d6cd3c79780b0c0e57068f0837f7493aa6

Modified Files
--------------
contrib/postgres_fdw/expected/postgres_fdw.out | 178 +++++++++++++++++-------
contrib/postgres_fdw/sql/postgres_fdw.sql | 68 ++++++---
2 files changed, 182 insertions(+), 64 deletions(-)

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