Add HHClientLinter to NON_DEFAULT_LINTERS

[Atry]

No description provided.

[fredemmott]

The change looks good, but I think we should run it on some projects - both ours, and others - first.

This is a lot of linters to enable in one go, and we should try to get some more signal on if this is currently a good configuration.

This also ties into #287 a bit: linter inclusion in general, 'all', and 'default' is not a good categorization system.

[fredemmott]

What do you think about leaving this PR for now, instead:

• finish the other todos on https://github.com/hhvm/hhast/projects/1
• leaving it for an explicit opt-in
• ... but make a new release that supports the opt-in, announce on hhvm.com/blog/ , with details on configuration and asking for feedback?

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