Remove maybe type from auxiliary payload.

The monitor connected and disconnected auxilary payloads were previously
using a maybe type of an array of unsigned bytes to represent an EDID.
Maybe types are not handled by D-Bus, so these events were not being
reported to the metrics servers.

This change instead represents the EDID as an array of unsigned bytes.
When no EDID can be obtained, an empty array is used.

Both event type UUIDs had to be changed in lock step with this fix to
because there were a small number of monitor connected and disconnected
events in the dev database. These new UUIDs will be documented in the
online wiki entry.

[endlessm/eos-sdk#2280]