[Magma]Rebalance exited with reason mover_crashed

* Had a four node cluster(replicas = 0)

* Loaded 10 million items

* While updating replicas observed rebalance exited with mover_crashed

Rebalance exited with reason {mover_crashed,

{unexpected_exit,

{'EXIT',<0.17732.3>,

{{{{{child_interrupted,

{'EXIT',<23333.21197.0>,socket_closed}},

[{dcp_replicator,spawn_and_wait,1,

[{file,"src/dcp_replicator.erl"},

{line,266}]},

{dcp_replicator,handle_call,3,

[{file,"src/dcp_replicator.erl"},

{line,127}]},

{gen_server,try_handle_call,4,

[{file,"gen_server.erl"},{line,636}]},

{gen_server,handle_msg,6,

[{file,"gen_server.erl"},{line,665}]},

{proc_lib,init_p_do_apply,3,

[{file,"proc_lib.erl"},{line,247}]}]},

{gen_server,call,

[<23333.21195.0>,{takeover,66},infinity]}},

{gen_server,call,

['replication_manager-default',

{dcp_takeover,'ns_1@172.23.123.4',66},

infinity]}},

{gen_server,call,

[{'janitor_agent-default',

'ns_1@172.23.123.5'},

{if_rebalance,<0.527.3>,

{dcp_takeover,'ns_1@172.23.123.4',66}},

infinity]}}}}}.

Rebalance Operation Id = a9f3a71674578481bab4293bd5c8b8b3

./testrunner -i /tmp/ankush.ini  -t bucket_param_tests.bucket_param_update.BucketParamTest.test_replica_update,nodes_init=4,num_items=10000000,replicas=0,bucket_storage=magma,sdk_timeout=60,bucket_eviction_policy=fullEviction,randomize_value=True,vbuckets=128,rerun=false,get-cbcollect-info=True,skip_cleanup=True,infra_log_level=debug,log_level=debug