m2v2: send CREATE and DESTROY events to Kafka

(cherry picked from commit b42f472c26a1562ced61f4e4b16a6729338a9ca4)

Change-Id: I3e32f2153bd883aa17d8cb79da8ef7de0f61c635
m2v2: generate sequence number for events

(cherry picked from commit 0836c04e6f660554bc5de4a4a51025ffc07bb5f6)

Change-Id: I7bc6ecb9fcfeee0103ffce5c039eedc182608150
m2v2: fix Kafka events for append operations

(cherry picked from commit 59938c74c3d71c757293901c586d763e30a5b376)

Conflicts:
	meta2v2/meta2_filters_action_content.c
	meta2v2/meta2_filters_misc.c

Change-Id: Ie88cf3218b1c4875f48d9503b267fa0e50675edf