Summary:
The packager dependencies CLI command always operates on --dev=true today. This means any tooling that needs to get the production dependencies (--dev=false) will always get the dev-mode list instead. For instance:
```
if (__DEV__) {
require('Foobar');
}
```
Previously, `Foobar.js` will always be listed in the CLI output. With this change, setting `--dev false` option will correctly skip `Foobar.js` in the output.
Reviewed By: cpojer
Differential Revision: D5163184
fbshipit-source-id: 203221ee5d6ecb7df575442f12f6c4c489bfbd46
d41c9d94fd