presto-main/src/main/java/io/prestosql/server/PluginManagerConfig.java/PluginManagerConfig/setMavenRemoteRepository
class PluginManagerConfig:    @Config("maven.repo.remote")
    public PluginManagerConfig setMavenRemoteRepository(String mavenRemoteRepository)
    {
        this.mavenRemoteRepository = ImmutableList.copyOf(Splitter.on(',').omitEmptyStrings().trimResults().split(mavenRemoteRepository));
        return this;
    }