Fixed typo in RequestResponseFuture.

[ifplusor]

What is the purpose of the change

Fixed typo in RequestResponseFuture.

Brief changelog

rename RequestResponseFuture.setSendReqeustOk to RequestResponseFuture.setSendRequestOk.

Verifying this change

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[coveralls]

Coverage increased (+0.05%) to 50.875% when pulling 78b6d7b on ifplusor:fixed-typo-in-RequestResponseFuture into 8ef01a6 on apache:master.

[wlliqipeng]

LGTM