Support Cisco Umbrella/OpenDNS Device ID & Remote IP

This is based on the information at
https://docs.umbrella.com/umbrella-api/docs/identifying-dns-traffic and
https://docs.umbrella.com/umbrella-api/docs/identifying-dns-traffic2 .
Using --umbrella by itself will enable Remote IP reporting. This can not
be used for any policy filtering in Cisco Umbrella/OpenDNS. Additional
information can be supplied using specific option specifications,
multiple can be separated by a comma:

--umbrella=orgid:1234,deviceid=0123456789abcdef

Specifies that you want to report organization 1234 using device
0123456789abcdef. For Cisco Umbrella Enterprise, see "Register (Create)
a device" (https://docs.umbrella.com/umbrella-api/docs/create-a-device)
for how to get a Device ID and "Organization ID endpoint"
(https://docs.umbrella.com/umbrella-api/docs/organization-endpoint) to
get organizations ID. For OpenDNS Home Users, there is no organization,
see Registration API endpoint
(https://docs.umbrella.com/umbrella-api/docs/registration-api-endpoint2)
for how to get a Device ID. Asset ID should be ignored unless
specifically instructed to use by support.

Signed-off-by: Brian Hartvigsen <brian.andrew@brianandjenny.com>

src/dns-protocol.h

@@ -82,6 +82,7 @@
 #define EDNS0_OPTION_CLIENT_SUBNET  8     /* IANA */
 #define EDNS0_OPTION_NOMDEVICEID    65073 /* Nominum temporary assignment */
 #define EDNS0_OPTION_NOMCPEID       65074 /* Nominum temporary assignment */
+#define EDNS0_OPTION_UMBRELLA       20292 /* Cisco Umbrella temporary assignment */
 
 struct dns_header {
   u16 id;