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
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REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/a8beece956ebf0659e64e229519f6e87b13b8b3a

Modified Files
--------------
src/backend/replication/basebackup.c | 75 ++++++++++++++++++----------
src/bin/pg_basebackup/t/010_pg_basebackup.pl | 8 +--
src/bin/pg_checksums/pg_checksums.c | 39 +++++++++++----
src/bin/pg_checksums/t/002_actions.pl | 4 +-
src/bin/pg_rewind/filemap.c | 43 +++++++++++-----
5 files changed, 116 insertions(+), 53 deletions(-)