On Windows, the 'socket' python module does not contain the
attributes TCP_KEEPCNT or TCP_KEEPINTVL, causing services
consuming the library to malfunction.
Adds conditionals for adding the mentioned socket attributes
to the socket options.
socket.SIO_KEEPALIVE_VALS cannot be added as a socket option
for Windows, as there is another way entirely to enable that
option.
Change-Id: I2e9746ae65400bbd23c3b48dfc3167de9eb66494
Partial-Bug: #1483696
33b24a6984