Bug 20795: Pass incrreased verbosity to zebra rebuild script

To test:
1 - Run koha-rebuild-zebra with multiple '-v'
2 - Note no increased verbosity
3 - Apply patch
4 - Run the updated koha-rebuild-zebra script with multiple '-v'
5 - Note increased verbosity

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 1dfb177d3f)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

debian/scripts/koha-rebuild-zebra

@@ -132,7 +132,7 @@ while [ -n "$*" ]; do
             force="yes"
             ;;
         -v|--verbose)
-            opt_verbose="-v"
+            opt_verbose="$opt_verbose -v"
             ;;
         -q|--quiet)
             quiet="yes"