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

Change-Id: I0658d4e7418ded0a8581032764973774f9ff0eca
Reviewed-on: http://review.couchbase.org/39368
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>