net: socks: Make SOCKS5 implementation transparent

Current SOCKS5 implementation is above socket level and every
higher layer protocol or application level needs to have
SOCKS5 related changes. This solution is based on socket
setsockopt(). Application caller has to set proxy details
through setsockopt() and socket:connect() will take care
creating connection.

Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@linux.intel.com>