Lock cycle (deadlock) during bucket delete and DCP client disconnect

./testrunner -i INI_FILE.ini get-cbcollect-info=True,get-logs=False,stop-on-failure=False,get-coredumps=True,fail_on_errors=1,GROUP=ALL -t xdcr.rebalanceXDCR.Rebalance.async_rebalance_in,items=100000,rdirection=unidirection,ctopology=chain,update=C1,delete=C1,rebalance=C2,num_rebalance=2,GROUP=P0;xmem

testcase failed in cleanup with bucket deletion issue - seen in 2i and ns_server as well - attaching logs