qa/suites/upgrade: update ignorelist with cephfs specific warnings (under stress-split)

The warnings are expected as the MDSs are upgraded and restarted.

Fixes: http://tracker.ceph.com/issues/71615
Signed-off-by: Venky Shankar <[email protected]>

Author: vshankar

qa/suites/upgrade/reef-x/stress-split/1-start.yaml

@@ -22,6 +22,10 @@ overrides:
       - OSDMAP_FLAGS
       - OSD_UPGRADE_FINISHED
       - Replacing daemon mds
+      - MDS_ALL_DOWN
+      - MDS_UP_LESS_THAN_MAX
+      - filesystem is offline
+      - with fewer MDS than max_mds
 tasks:
 - install:
     branch: reef

qa/suites/upgrade/squid-x/stress-split/1-start.yaml

@@ -21,6 +21,10 @@ overrides:
       - OSDMAP_FLAGS
       - OSD_UPGRADE_FINISHED
       - Replacing daemon mds
+      - MDS_ALL_DOWN
+      - MDS_UP_LESS_THAN_MAX
+      - filesystem is offline
+      - with fewer MDS than max_mds
 tasks:
 - install:
     branch: squid