Consider re-licensing to AL v2.0, like RocksDB and pending React

[apergy]

Quoting @wohali in relation to facebook/react#10191:

Hi there,

The Apache Software Foundation Legal Affairs Committee has announced that the so-called 'Facebook BSD+Patents License' is no longer allowed to be used as a direct dependency in Apache projects.

This has lead to a lot of upset and frustration in the Apache community, especially from projects requiring similarly-licensed code as direct dependencies - the chief of these being RocksDB.

However, we (the Apache Software Foundation) have just received word that RocksDB will be re-licensing their code under the dual Apache License v2.0 and GPL 2 licenses.

As a user of React.JS in an ASF top-level project (Apache CouchDB), please consider re-licensing React.JS under similar terms. Otherwise, many ASF projects such as our own will have to stop relying on and building with React.

A previous bug (#9760) suggested I mention @lacker in this issue when asking licensing questions, so I'm doing so.

Thank you kindly for your consideration.

[cpojer]

Please find our official statement from us here: https://code.facebook.com/posts/112130496157735/explaining-react-s-license/