Solution: use tcp_open_socket function

Problem: tcp_connecter_t and tcp_listener_t duplicate code around opening and configuring a TCP socket

Solution: extract common parts into tcp_open_socket function

Solution: add const

Solution: let socks_connecter_t derive from stream_connecter_base_t and remove duplicate code

Solution: change back the indentifier endpoint to the one passed by the
user rather than the resolved one, otherwise when the user passes the
same string to the disconnect call they do not match anymore

Solution: fix address passed and refactor set_local_address to remove code duplication and unnecessary address parsing when ZMQ_USE_FD is used

Problem: stream listeners do not provide correct local and remote address information (test_monitor is failing)

Solution: query local and remote addresses on accepting a connection

Solution: query the local address and set it

Solution: pass the local address by subclasses to create_engine

Problem: get_socket_address and get_socket_name not available throughout libzmq and restricted to local address

Solution: move to address.hpp/.cpp and generalize

Solution: add monitor event socket option

Problem: socks_connecter_t, vmci_connecter_t and vmci_listener_t duplicate code with stream_*_base_t

Solution: add TODO comments to resolve this debt

Solution: change to refer to the context

Solution: pull up to base class

Solution: also use get_socket_address from base class

Solution: also use get_socket_address from base class

Solution: perform explicit cast

Solution: extract function create_engine into base class

Solution: extract common base class stream_listener_base_t

Solution: make them private and adapt initialization order

Solution: removed definitions and uses in subclasses

Solution: add underscore prefix

Solution: add underscore prefix

Solution: pull up common code, introduce new create_engine function in base class

Solution: pull up

Solution: pull up tcp_connecter_t::rm_handle and use in all subclasses

Problem: process_plug, get_new_reconnect_ivl and add_reconnect_timer duplicated across subclasses of stream_connector_base_t

Solution: pull up to stream_connector_base_t

Solution: pull up to stream_connecter_base_t

Solution: extract common base class stream_connecter_base_t

Solution: replace by checks against valid value of _handle

Solution: replace by checks against valid value of _handle

Solution: rename to _reconnect_timer_started

Solution: rename to _reconnect_timer_started

Solution: add underscore prefix to data members

Solution: add underscore prefix to data members

Solution: declare _endpoint const

Solution: extract initialization code into get_peer_address function and declare _peer_address const

Solution: assign result to address

Fixes #3376

Solution: remove them

Solution: prefer CXX11 atomics if they are available to compiler
intrinsics.
test_hwm_pubsub fails 50% of the times on PPC64 and RISC-V with an
apparent memory corruption of messages sent by the application thread
to the I/O thread when using compiler intrinsics.
Switching to CXX11 atomics makes the test reliable again. The
standard API should be preferred anyway, if available.