processVerifiedMessage checks the current state of the database against the
identity key from an incoming verification sync message to determine whether or
how to update our local record.
When syncing a DEFAULT status and we have no local record, it's a no-op, but
we'll log it.
When syncing a DEFAULT status and we have non-default record with the same key,
mark it as default.
When syncing a VERIFIED status and either:
1. we have no key on record,
2. we have have a different key on record, or
3. we have the same key on record, but not verified
mark it as verified.
Otherwise do nothing.
References: https://github.com/WhisperSystems/Signal-Android/blob/master/src/org/thoughtcrime/securesms/util/IdentityUtil.java#L129
// FREEBIE
Ensure processVerified resolves
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