[functional test] : Rebalance hangs seen (swap/in)

./testrunner -i /tmp/testexec.29541.ini -p get-cbcollect-info=True,GROUP=n1ql_op_with_timers,force_disable_new_orchestration=True -t eventing.eventing_rebalance.EventingRebalance.test_swap_rebalance_with_different_topologies,doc-per-day=10,dataset=default,nodes_init=5,services_init=kv-eventing-eventing-eventing:index:n1ql-eventing:n1ql,groups=simple,server_out=4,services_in=kv,n1ql,reset_services=True,handler_code=n1ql_op_with_timers,GROUP=n1ql_op_with_timers

./testrunner -i /tmp/testexec.11739.ini -p get-cbcollect-info=True,GROUP=n1ql_op_with_timers,force_disable_new_orchestration=True -t eventing.eventing_rebalance.EventingRebalance.test_eventing_rebalance_in_when_existing_eventing_node_is_processing_mutations,nodes_init=4,services_init=kv-eventing-index-n1ql,dataset=default,groups=simple,reset_services=True,doc-per-day=10,sock_batch_size=8,worker_count=8,cpp_worker_thread_count=8,handler_code=n1ql_op_with_timers,GROUP=n1ql_op_with_timers