store masterinfo data in elasticsearch#253

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yinzhigang wants to merge 5 commits intogo-mysql-org:masterfrom

yinzhigang:masterinfo_elasticsearch

Commits on Apr 23, 2018

Add elasticsearch to store master info
zhigang
committed
Change masterInfo from pointer to interface
zhigang
committed

Commits on May 14, 2018

loadMasterInfo return error if can not connect to elasticsearch
zhigang
committed

Commits on May 17, 2018

elasticsearch data_dir example in river.toml
zhigang
committed
Merge branch 'master' into masterinfo_elasticsearch
zhigang
committed