Allow IMPORT FOREIGN SCHEMA within pl/pgsql.

Since IMPORT FOREIGN SCHEMA has an INTO clause, pl/pgsql needs to be
aware of that and avoid capturing the INTO as an INTO-variables clause.
This isn't hard, though it's annoying to have to make IMPORT a plpgsql
keyword just for this.  (Fortunately, we have the infrastructure now
to make it an unreserved keyword, so at least this shouldn't break any
existing pl/pgsql code.)

Per report from Merlin Moncure.  Back-patch to 9.5 where IMPORT FOREIGN
SCHEMA was introduced.

Report: <CAHyXU0wpHf2bbtKGL1gtUEFATCY86r=vkxfcacvctmq70mc...@mail.gmail.com>

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/baebab3ace480477f210dadc4633d8d119dfa978

Modified Files
--------------
src/pl/plpgsql/src/pl_gram.y    | 47 +++++++++++++++++++++++++++++++++--------
src/pl/plpgsql/src/pl_scanner.c |  1 +
2 files changed, 39 insertions(+), 9 deletions(-)


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