Previously, rconn and vconn only allowed users to find out about the
remote IP address. This set of changes allows users to retrieve the
remote port, local IP, and local port used for the connection.
The TCP and SSL vconn implementations had a lot of common code to make
and accept TCP connections, which this commit factors out into common
functions in socket-util.c.
Also adds the ability to bind ptcp and pssl vconns to a particular IP
address instead of the wildcard address.
Older versions of Open vSwitch implemented OpenFlow in the kernel over
a Netlink channel, and this code was here to work around some issues with
that, but now it is unnecessary since the OpenFlow kernel implementation is
gone.
vconn_connect() is defined to return 0 on success or a positive errno
value on failure, but it was possible to get a negative value (EOF). This
commit changes this to ECONNRESET to match caller expectations.
