pgsql: Add prefix checks in exclude lists for pg_rewind, pg_checksums a

Add prefix checks in exclude lists for pg_rewind, pg_checksums and base backups

An instance of PostgreSQL crashing with a bad timing could leave behind
temporary pg_internal.init files, potentially causing failures when
verifying checksums.  As the same exclusion lists are used between
pg_rewind, pg_checksums and basebackup.c, all those tools are extended
with prefix checks to keep everything in sync, with dedicated checks
added for pg_internal.init.

Backpatch down to 11, where pg_checksums (pg_verify_checksums in 11) and
checksum verification for base backups have been introduced.

Reported-by: Michael Banck
Author: Michael Paquier
Reviewed-by: Kyotaro Horiguchi, David Steele
Discussion: https://postgr.es/m/62031974fd8e941dd8351fbc8c7eff60d59c5338.camel@credativ.de
Backpatch-through: 11

Branch
------
REL_11_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/da2a7180aa0ed18d4e283a934d3f789912fd99c5

Modified Files
--------------
src/backend/replication/basebackup.c              | 75 +++++++++++++++--------
src/bin/pg_basebackup/t/010_pg_basebackup.pl      |  8 +--
src/bin/pg_rewind/filemap.c                       | 43 +++++++++----
src/bin/pg_verify_checksums/pg_verify_checksums.c | 39 ++++++++----
4 files changed, 113 insertions(+), 52 deletions(-)