Deflake total sum of full synchronizations

Deflake test "PSYNC2: total sum of full synchronizations at least 4"
Explaination: during the prior test "PSYNC2: generate load while killing
replication links" load is generated on the master, and the replica's
connection is killed multiple times. On busy machine this load can force
the replica to full sync. There is no guarantee that the replicas will
find the necessary bytes in the COB.

Signed-off-by: naglera <[email protected]>

tests/integration/psync2.tcl

@@ -290,14 +290,17 @@ start_server {} {
             show_cluster_status
         }
 
-        test "PSYNC2: total sum of full synchronizations is exactly 4" {
+        test "PSYNC2: total sum of full synchronizations at least 4" {
+            # During the setup, four full syncs were performed. It is also possible that one
+            # of the disconnected replicas may be forced to full sync during the 
+            # 'generate load while killing replication links' test.
             set sum 0
             for {set j 0} {$j < 5} {incr j} {
                 incr sum [status $R($j) sync_full]
             }
             if {$sum != 4} {
                 show_cluster_status
-                assert {$sum == 4}
+                assert {$sum >= 4}
             }
         }