net: socks: Prefer setsockopt() API instead of legacy proxy api

Applications should use setsockopt() to setup the SOCKS5 proxy,
so the old API file, which is using net_context directly, is
moved SOCKS5 directory.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>

subsys/net/lib/sockets/CMakeLists.txt

@@ -21,4 +21,8 @@ if(CONFIG_NET_SOCKETS_NET_MGMT)
   zephyr_include_directories(${ZEPHYR_BASE}/subsys/net/ip)
 endif()
 
+if(CONFIG_SOCKS)
+  zephyr_include_directories(${ZEPHYR_BASE}/subsys/net/lib/socks)
+endif()
+
 zephyr_link_libraries_ifdef(CONFIG_MBEDTLS mbedTLS)

subsys/net/lib/sockets/sockets.c

@@ -18,7 +18,11 @@ LOG_MODULE_REGISTER(net_sock, CONFIG_NET_SOCKETS_LOG_LEVEL);
 #include <syscall_handler.h>
 #include <sys/fdtable.h>
 #include <sys/math_extras.h>
-#include <net/socks.h>
+
+#if defined(CONFIG_SOCKS)
+#include "socks.h"
+#endif
+
 #include "../../ip/net_stats.h"
 
 #include "sockets_internal.h"

subsys/net/lib/socks/socks.c

@@ -11,9 +11,9 @@ LOG_MODULE_REGISTER(net_socks, CONFIG_SOCKS_LOG_LEVEL);
 
 #include <zephyr.h>
 #include <net/socket.h>
-#include <net/socks.h>
 #include <net/net_pkt.h>
 
+#include "socks.h"
 #include "socks_internal.h"
 
 static void socks5_method_rsp_cb(struct net_context *ctx,