mon/test_mon_osdmap_prune: Use first_pinned instead of first_committed

In the test, we assume the trimming of osdmaps is done if osdmap_first_committed is equal to the epoch of the map upto which we had to trim.
osdmap_first_committed however returns the value of cached_first_committed which is updated before the Paxos proposal for trim goes through.
Normally, this is not a problem as when a refresh() happens, cached_first_committed will be corrected to the value before the trim was proposed if the Paxos proposal failed.
But for this test, we encounter a failure in this case as the osdmap_first_committed will not be equal to the osdmap_manifest.first_pinned as the trim never went through.
Changing the test to verify that osdmap_manifest.first_pinned has changed to the correct value is a better way to signify that the trim is complete for the purpose of this test.

Fixes: https://tracker.ceph.com/issues/47838
Signed-off-by: Aishwarya Mathuria <[email protected]>

Author: amathuria

qa/workunits/mon/test_mon_osdmap_prune.sh

@@ -33,7 +33,9 @@ function wait_for_trim() {
 
   for ((i=0; i < ${#delays[*]}; ++i)); do
     fc=$(ceph report | jq '.osdmap_first_committed')
-    if [[ $fc -eq $epoch ]]; then
+    manifest="$(ceph report | jq '.osdmap_manifest')"
+    first_pinned_map=$(ceph report | jq '.osdmap_manifest.first_pinned')
+    if [[ $first_pinned_map -eq $epoch ]]; then
       return 0
     fi
     sleep ${delays[$i]}