fix context import

[dreambo8563]

cleanup: replace "x/net/context" import with "context" (#2439)

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[dreambo8563]

I signed it

[menghanl]

This file is generated, and shouldn't be manually edited.
Also, if you use go1.9 and above, this shouldn't be a problem because "golang.org/x/net/context" is just a type alias.

The codegen change is already submitted upstream. We are waiting for a new release to update out dependencies.