Bug 17038: Fix XSS in catalogue/search.pl

Bug 17038: Fix XSS in catalogue/search.pl

Test plan:
Search for something like:
  \";alert(1)//135

=> Without this patch you will see the alert
=> With this patch, no more alert

Note that this fix the parameters idx, q and op

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit b543fa74fe888b9e53cfc06ac58e2f7ac1689ae5)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>