Bug 11252: remove deprecated -munge-config switch from rebuild_zebra.pl

Bug 11252: remove deprecated -munge-config switch from rebuild_zebra.pl

The -munge-config switch has been deprecated for years, and
trying to use it would either not work at all or, if it did "work",
almost certainly damage one's Zebra configuration for Koha.

This patch removes this switch.

To test:

[1] Run rebuild_zebra.pl and verify that no mention is made
    of -munge-config.
[2] Run rebuild_zebra.pl to index records in one's test database
    and verify that there are no regressions.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Removing a really dangerous option

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes all tests and QA script.
Ran rebuild_zebra.pl with various options and confirmed
that data was reindexed successfully.
No regressions found.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit b26870e53dc1b00e2966187b9b5298360af6024e)
Signed-off-by: Fridolin SOMERS <fridolin.somers@biblibre.com>