don't rewrite the hex registry.ets anymore, because it's not possible with new
mix-hex. After the issue will be fixed https://github.com/hexpm/hex/issues/367
HEX_OFFLINE environment can be used to disable the communication with hex.pm.
Using of new deps-vendoring approch, the registry cache will not be needed.
don't rewrite the release config anymore. Before it was made to configure lager
journald backend for release env. Now we make this configuration using
release configuration in applications
it's possible to configure ERTS location using distillery config
releaseenv. Now we make this configuration using release configuration in applications