pg_createsubscriber: Improve error messages.

Consistently, an option name is used in the error messages where
applicable. Also, change the code to use pg_fatal() instead of a
combination of pg_log_error() and exit().

Author: vignesh C <vignes...@gmail.com>
Reviewed-by: Hayato Kuroda <kuroda.hay...@fujitsu.com>
Reviewed-by: Amit Kapila <amit.kapil...@gmail.com>
Discussion: 
https://postgr.es/m/caldanm0hxf1rh27lp7vislznssjbssy8a64m5p6ududabq6...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/898c131b58a0b62833e10f3556f993d0d385f941

Modified Files
--------------
src/bin/pg_basebackup/pg_createsubscriber.c        | 26 ++++++----------------
src/bin/pg_basebackup/t/040_pg_createsubscriber.pl |  4 ++--
2 files changed, 9 insertions(+), 21 deletions(-)

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