MB-25105: Add Ephemeral fail_new_data variant to item pager tests
MB-25105: Add Ephemeral fail_new_data variant to item pager tests

Add a third variant of the item pager tests for Ephemeral with
fail_new_data specified (in addition to existing persistent and
ephemeral-auto_delete.

Update the test expectations such that fail_new_data should not
automatically delete anything (apart from expired items).

Note that one test -
EphemeralOrPersistent/STItemPagerTest.ExpiredItemsDeletedFirst/1 where
GetParam() = ("ephemeral", "fail_new_data")) currently fails due to
MB-25105, and hence is currently skipped.

Change-Id: Ieecc01f041c678c8bdc80a2c59303a083b82577c
Reviewed-on: http://review.couchbase.org/80273
Reviewed-by: Sriram Ganesan <fde85c3124eed34938bb85159f430bf7e5b650f6@couchbase.com>
Reviewed-by: Jim Walker <1cd02e31b43620d7c664e038ca42a060d61727b9@couchbase.com>
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine