Reject combining "epoch" and "infinity" with other datetime fields.

Datetime input formerly accepted combinations such as
'1995-08-06 infinity', but this seems like a clear error.
Reject any combination of regular y/m/d/h/m/s fields with
these special tokens.

Joseph Koshakow, reviewed by Keisuke Kuroda and myself

Discussion: 
https://postgr.es/m/caavxfhdm8wwxwg_ffraj1nthimwb7yxs2ykczct8q0a2zom...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/bcc704b52490492e6bd73c4444056b3e9644504d

Modified Files
--------------
src/backend/utils/adt/datetime.c       | 40 ++++++++++------
src/test/regress/expected/horology.out | 85 ++++++++++++++++++++++++++++++++++
src/test/regress/sql/horology.sql      | 23 +++++++++
3 files changed, 133 insertions(+), 15 deletions(-)

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