[BP] MB-33957: Change ephemeral eviction policy for cursor dropping tests

[Backport of MB-32099.]

The original patch is http://review.couchbase.org/#/c/102806/
with Change-Id: I5a3f6320b6615a0d4866c54dfe30345989689ebb

This patch attempts to fix the intermittent cv failure, caused by the
pager running and deleting items on an ephemeral bucket. This would
cause an unexpected deletion opcode intermittently. This was
identified on both "test dcp cursor dropping" and "test dcp cursor
dropping (replication)", but not "test dcp cursor dropping backfill".
Seeming as these are similar tests, if we see any CV failures like
this in the future on the backfill test, the same fix should be
applied to it too.

Change-Id: I751d4ba3872d4d70f2de0691edb9bfeab5294f92
Reviewed-on: http://review.couchbase.org/108396
Reviewed-by: Dave Rigby <[email protected]>
Well-Formed: Build Bot <[email protected]>
Tested-by: Build Bot <[email protected]>

Author: owend74

engines/ep/tests/ep_testsuite_dcp.cc

@@ -6244,7 +6244,8 @@ BaseTestCase testsuite_testcases[] = {
                     create at least 1000 items when our residency
                     ratio gets to 90%. See test body for more details. */
                  "cursor_dropping_lower_mark=60;cursor_dropping_upper_mark=70;"
-                 "chk_remover_stime=1;max_size=6291456;chk_max_items=8000;",
+                 "chk_remover_stime=1;max_size=6291456;chk_max_items=8000;"
+                 "ephemeral_full_policy=fail_new_data",
 
                  // TODO RDB: Cannot store any item (ENGINE_ENOMEM).
                  // Needs to resize 'max_size' to consider RocksDB
@@ -6259,7 +6260,8 @@ BaseTestCase testsuite_testcases[] = {
                   create at least 1000 items when our residency
                   ratio gets to 90%. See test body for more details. */
                  "cursor_dropping_lower_mark=60;cursor_dropping_upper_mark=70;"
-                 "chk_remover_stime=1;max_size=6291456;chk_max_items=8000;",
+                 "chk_remover_stime=1;max_size=6291456;chk_max_items=8000;"
+                 "ephemeral_full_policy=fail_new_data",
 
                  // TODO RDB: Cannot store any item (ENGINE_ENOMEM).
                  // Needs to resize 'max_size' to consider RocksDB