Revert "MB-8066 Compactor should only evict bodies on request"

This reverts commit b7fbf10ad13bec17aa3630a94ef944d8c5240ba7.

Conflicts:
	src/db_compact.c

Change-Id: Id8a5a74bf4babe75856a6bc7031a7a7f15875110
Reviewed-on: http://review.couchbase.org/26682
Reviewed-by: Fulu Li <fulu@couchbase.com>
Reviewed-by: Filipe David Borba Manana <fdmanana@gmail.com>
Tested-by: Aaron Miller <apage43@ninjawhale.com>