An iterator over OptionValueContainer keys.

Review Request #2472 - Created July 13, 2015 and submitted

Information
Benjy Weinberger
pants
a616705...
Reviewers
pants-reviews
stuhood
Yields exactly one key per option. If multiple keys point to the same
value (because the underlying option was registered with multiple names),
only yields one of them.

Also fixes a minor bug with inverse dest mapping computation. That computation
must properly be done only after all options have been registered, so it's
not confounded by options on inner scopes that shadow names in outer scopes.

CI in flight here: https://travis-ci.org/pantsbuild/pants/builds/70813876

Cody Gibb
Stu Hood
Benjy Weinberger
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted as 94aa2b0b1748189de847cdc676f526d7905e338b.

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