Move-assign a basic_seq_packet_socket
from another.
basic_seq_packet_socket & operator=( basic_seq_packet_socket && other);
This assignment operator moves a sequenced packet socket from one object to another.
The other basic_seq_packet_socket
object from which the move will occur.
Following the move, the moved-from object is in the same state as if
constructed using the basic_seq_packet_socket(const executor_type&)
constructor.