support for cluster can acquire multi be in same host and fixed some issues#47

Merged

imay merged 8 commits intoapache:masterfrom

chenhao7253886:master

Aug 26, 2017

Commits on Aug 25, 2017

cluster can acquire more backends in same host
chenhao16
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compile failed
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count* 's subquery with orderby exec error
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modify show processlist result and check name format error
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merge log and add cancel cluster for root, show backends for users in cluster
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Commits on Aug 26, 2017

returns null when the param does not match
chenhao16
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update UpdateClusterAndBackends to BackendIdsUpdateInfo
chenhao16
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correct Licenses
chenhao16
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