ecore_con: bug workaround SO_REUSEADDR and EADDRINUSE from bind (fix)

ecore_con: bug workaround SO_REUSEADDR and EADDRINUSE from bind (fix)

what i'm seeing is this with local unix sockets:

1. server process not cleanly shut down (kill -9 for example).
2. run server process again and bind fails due to EADDRINUSE
3. we ARE doing setsockopt() with SO_REUSEADDR set to 1 ...

this just makes no sense because setsockopt() SHOULD allow use to
re-use... the previous efreetd process for example is gone. no such
process, yet socket is not re-usable. this should just not happen due
to SO_REUSEADDR, but it does. this has nasty consequences like efreetd
maybe never running because of stale sockets. this should never have
happened, but it does. odd. so a hacky workaround:

1. try bind.
2. if bind fails with EADDRINUSE and its a socket path AND
pd->unlink_before_bind is NOT set... then try a connect to the socket.
3. if connect succeeds then fail as normal (close socket and error on
bind'ing)
   if connect fails then we have a stale socket, so unlink it
forcibly. create the socket again and try bind again.

hacky but... fixes the core issue.

@fix