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Merge pull request influxdata#2400 from influxdb/client-write-credent…

…ials-2391

Always send auth headers for client requests if present

Merge pull request influxdata#2367 from influxdb/localhost-2350

Always use localhost, not host name

Merge pull request influxdata#2295 from influxdb/check_null_fix

Use nil as default return value for MapCount