Icinga: Do not ship event handlers for Nagios

Icinga: Do not ship event handlers for Nagios

These are owned (hence being writable) by "nobody", posing a potential
security risk. Since the files itself were already exluded from being
shipped, their parent directory should be as well.

This patch should reduce the amount of executable files being owned by
nobody to zero after upgrading to Core Update 157. Due to complexity
reasons, not all applications available in Pakfire could be tested,
though, so your mileage may vary.

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>