scanner: Update unit tests

Update scan coordinator unit tests to handle primary key
format change and set index state to active.

Change-Id: Ia9c88700de78b950a31fac8311050752c51f812a
Reviewed-on: http://review.couchbase.org/43546
Reviewed-by: Deepkaran Salooja <deepkaran.couchbase@gmail.com>
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>
Tested-by: Sarath Lakshman <sarath@couchbase.com>