Fixes for #710#issuecomment-297453955

[mocchira]

Fix for leo-project/leofs#710 (comment).

Prev this PR

[E] [email protected]  2017-04-26 18:28:22.342160 +0300    1493220502  leo_mq_consumer:consume/4   526 [{module,leo_membership_mq_client},{id,mq_persistent_node},{cause,{noproc,{gen_server,call,[{rex,'[email protected]'},{call,erlang,node,[],<0.47.0>},10000]}}}]
[E] [email protected]  2017-04-26 18:28:22.353530 +0300    1493220502  leo_mq_consumer:consume/4   526 [{module,leo_membership_mq_client},{id,mq_persistent_node},{cause,{noproc,{gen_server,call,[{rex,'[email protected]'},{call,erlang,node,[],<0.47.0>},10000]}}}]
[E] [email protected]  2017-04-26 18:28:22.364200 +0300    1493220502  leo_mq_consumer:consume/4   526 [{module,leo_membership_mq_client},{id,mq_persistent_node},{cause,{noproc,{gen_server,call,[{rex,'[email protected]'},{call,erlang,node,[],<0.47.0>},10000]}}}]
[E] [email protected]  2017-04-26 18:28:22.375630 +0300    1493220502  leo_mq_consumer:consume/4   526 [{module,leo_membership_mq_client},{id,mq_persistent_node},{cause,{noproc,{gen_server,call,[{rex,'[email protected]'},{call,erlang,node,[],<0.47.0>},10000]}}}]
[E] [email protected]  2017-04-26 18:28:22.387463 +0300    1493220502  leo_mq_consumer:consume/4   526 [{module,leo_membership_mq_client},{id,mq_persistent_node},{cause,{noproc,{gen_server,call,[{rex,'[email protected]'},{call,erlang,node,[],<0.47.0>},10000]}}}]

error logs were filled with the above error after restarting a storage node in a cluster.

After this PR,
Those errors will get disappeared.