Refactor TAP test code for file comparisons into new routine in Utils.pm

This unifies the output used should any differences be found in the
files provided, information that 027_stream_regress did not show on
failures.  TAP tests of pg_combinebackup and pg_upgrade now rely on the
refactored routine, reducing the dependency to the diff command.  The
callers of this routine can optionally specify a custom line-comparison
function.

There are a couple of tests that still use directly a diff command:
001_pg_bsd_indent, 017_shm and test_json_parser's 003.  These rely on
different properties and are left out for now.

Extracted from a larger patch by the same author.

Author: Ashutosh Bapat
Discussion: https://postgr.es/m/z6rqs-tmzgyjl...@paquier.xyz

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/169208092f5c98a6021b23b38f03a5d65f84ad96

Modified Files
--------------
src/bin/pg_combinebackup/t/002_compare_backups.pl | 19 ++---------
src/bin/pg_upgrade/t/002_pg_upgrade.pl            | 22 +++---------
src/test/perl/PostgreSQL/Test/Utils.pm            | 41 +++++++++++++++++++++++
src/test/recovery/t/027_stream_regress.pl         | 14 ++++----
4 files changed, 53 insertions(+), 43 deletions(-)

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