gnmi: order deletes before updates when logging subscribe response
gnmi: order deletes before updates when logging subscribe response

Showing deletes at the end has caused confusion, since it may appear
that after some updates, the path is deleted. The gNMI spec states
that deletes within a notification must be processed ahead of
updates, so it seems better to show them in that order too.

Change-Id: Ie82e21ffa3add1b7b518014dfb3b1d5b3d277d62

aristanetworks/goarista,aristanetworks/goarista