Tzu-ping Chung fc810d7353 Add --unstable-feature=resolver ...

This introduces a new general option --unstable-feature that can be used
to opt into "preview" features in pip not enabled by default. Currently
the only available feature is "resolver".

A stub resolver interface (which would fail on invocation) is provided
to respond to the flag.

The --unstable-feature option is hidden from --help since the resolver
does not yet work. This suppression should be removed when we release
the resolver for general/public testing.

2020-03-11 18:51:01 +08:00

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