CVE-2022-38023 s4:rpc_server/netlogon: improve CVE-2020-1472(ZeroLogon) debug messages

CVE-2022-38023 s4:rpc_server/netlogon: improve CVE-2020-1472(ZeroLogon) debug messages

In order to avoid generating useless debug messages during make test,
we will use 'CVE_2020_1472:warn_about_unused_debug_level = 3'
and 'CVE_2020_1472:error_debug_level = 2' in order to avoid schannel warnings.

Review with: git show -w

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15240

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>