Add support for drill tool to check_dig (#1218)

[Alexander Wittig]

@skottler I thought I already submitted this as a pull request 3 months ago,
but the montitoring-plugins guys didn't like it. I'm not very familiar with
git and github, so if I did it wrong please feel free to submit it properly
so it can be included upstream (which was my main intent in the first place,
patching it in the FreeBSD ports is not the right way to fix this)

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Reply to this email on GitHub:
https://github.com/monitoring-plugins/monitoring-plugins/pull/1218#issuecomment-38231224
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