This instructs the `EventLoopGroupFactory` to daemonize newly created
event loop group threads as per Netty's `DefaultThreadFactory`. This
allows applications to shutdown when the last user thread ends, without
explicitly calling `close` to the Neo4j driver instance, which is in
line with other database drivers such as Postgres JDBC or MySQL JDBC.
In addition, this might become relevant with Netty 5 at some point in
the future, too. See: netty/netty#2832.