gpo: Backup a policy folder containing GPE.INI

gpo: Backup a policy folder containing GPE.INI

The GPE.INI file does not appear to be documented anywhere in the
protocol specifications and seems to be due to legacy code. It appears
that it used to be how the gPCUserExtensionNames and
gPCMachineExtensionNames were maintained without the requirement for
LDAP.

All we do is ignore the parsing of this file and copy it over as binary.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13825

Signed-off-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Tue Mar 12 01:41:32 UTC 2019 on sn-devel-144