CBLT-300:  replace 'last_done_ios_bld' and 'last_done_and_bld' with 'last_done_and_ios_bld'

Change-Id: Ic28ce7724a4abeb9e08c632668038c195c4ee992
Reviewed-on: http://review.couchbase.org/39369
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>