MB-9879: Do not dump detailed info in concurrency throttle

Today concurrency throttle dump detailed process info if a vb
replicator crashed. The info contains doc contents which is
pointless and could spam logs. This commit removes dumps it
in XDCR logs.

Change-Id: Iebc3610a487c431684586db7bbeaf611b495324b
Reviewed-on: http://review.couchbase.org/31790
Reviewed-by: Junyi Xie <junyi.couchbase@gmail.com>
Tested-by: Junyi Xie <junyi.couchbase@gmail.com>