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由 nobodyiam 提交于
Refactor meta server related logic so that apollo-core is common enough to go maven central repository. 1. Remove apollo-env.properties from apollo-core, so that it's possible to deploy apollo-client to maven central repository. 2. Add MetaServerProvider spi so that users could customize how they find apollo meta servers. 3. Refactor env related utils so that Env.UNKNOWN is returned for invalid env string instead of null.
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