[BEAM-3156] Fix BigTableIO to use non-deprecated Futures.addCallback function

[rniemo-g]

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Jira issue: https://issues.apache.org/jira/browse/BEAM-3156
This PR changes which Futures.addCallback() overload we call. This is because the overload we're using is being deprecated.

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[reuvenlax]

lgtm

[chamikaramj]

LGTM. I'll merge.

Thanks.

[chamikaramj]

Run Java PreCommit.

[chamikaramj]

Run Java PreCommit

[rniemo-g]

Run Java PreCommit

[rniemo-g]

It looks like the failed test was a timeout -- mind taking a look at this again?

[chamikaramj]

Looks like Jenkins is stable now. I'll wait for the current run.