s3/rpc_server: Character Encode Spotlight Queries

s3/rpc_server: Character Encode Spotlight Queries

Fix path escaping in Spotlight so paths with spaces or special
characters can be properly matched to tracker paths.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=12688

Based-on-a-patch-from: Mike M Pestorich <mmpestorich@gmail.com>
(similar to github.com/netatalk/netatalk/commit/90aa43d)

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Jul 10 23:17:20 CEST 2018 on sn-devel-144