smbstatus: Tell the user that smbstatus can only be run as root.

smbstatus: Tell the user that smbstatus can only be run as root.

In the meantime smbstatus tries to collection information from tdb's
which are only accessible by root as they contain sensitive information
like session keys and other secrets. This means smbstatus can no longer
be executed as a user.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11012

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Tue Dec 16 18:54:41 CET 2014 on sn-devel-104