Adding ALL_HOSTNAMES = True in secondary rebalance test

Change-Id: I7c9acc4329acbe4453da7eb09a1f47bc3a227d75
Reviewed-on: https://review.couchbase.org/c/perfrunner/+/191128
Tested-by: Build Bot <[email protected]>
Reviewed-by: vikas chaudhary <[email protected]>

Author: devanshsa5

perfrunner/tests/secondary.py

@@ -1471,6 +1471,8 @@ def run(self):
 
 class SecondaryRebalanceTest(SecondaryIndexingScanTest, RebalanceTest):
 
+    ALL_HOSTNAMES = True
+
     """Measure rebalance time for indexer with scan and access workload."""
 
     COLLECTORS = {'secondary_stats': True, 'secondary_latency': True,