Keep track of the active timestamp returned by projector
Update timestamp on SanpshotMarker for type 1 and 2

Change-Id: Id972f5b4142a471e7902c3208a6be680089df64c
Reviewed-on: http://review.couchbase.org/43952
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>
Reviewed-by: Deepkaran Salooja <deepkaran.couchbase@gmail.com>
Reviewed-by: John Liang <johliang00@gmail.com>
Tested-by: John Liang <johliang00@gmail.com>