Remove multi-node support for now

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Use gen_server:info instead of cast

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Fixed port choosing

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Restore proper protocol handling

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Use distinctive tags for tests

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>