Rename checkpoint manager functions with TAP in them

We use the checkpoint maanger for many different cursor types so
we shouldn't have TAP in the names of functions in order to
advertise them as being more general.

Change-Id: I2f17d4db9332b2f5c52cb4e0764bf76bb982864a
Reviewed-on: http://review.couchbase.org/41509
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>