[Tizen] Check signature value using xmlsec1 library

Based on API provided by xmlsec1 library, signature value and reference
are checked.
Fix Backend

Align the wrapper script to have the correct behavior
Remove setuid bit in package-helper
Adapt the user check function for xwalkctl binary

BUG=XWALK-1731

Signed-off-by: Baptiste DURAND <baptiste.durand@open.eurogiciel.org>
Signed-off-by: Sabera Djelti (sdi2) <sabera.djelti@open.eurogiciel.org>