net: Restructure network protocols

This commit restructures the network protocols. Changes applied are:

- Move lib/iot/ to subsys/net/lib
- Move network protocol headers to include/net
- Move lib/iot/zoap/link-format.h to include/net/zoap_link_format.h
  and link-format.c to zoap_link_format.c
- Move tests/iot/ to tests/net/lib/
- Adapt sample code
- Adapt build system
- Modify doxygen paths

Change-Id: I37085fa4cc76a8a8e19a499ecb4e87b451120349
Signed-off-by: Flavio Santes <flavio.santes@intel.com>

Author: 1010101001010101

doc/doxygen.config

@@ -106,7 +106,8 @@ INPUT                  = \
                         include/arch/nios2/ \
                         lib/libc/minimal/include/ \
                         ext/lib/crypto/tinycrypt/include/ \
-                        lib/iot/zoap/zoap.h \
+                        include/net/zoap.h \
+                        include/net/dns_client.h \
                         tests/ztest/include/
 INPUT_ENCODING         = UTF-8
 FILE_PATTERNS          = "*.c" "*.h" "*.S"

include/iot/dns_client.h renamed to include/net/dns_client.h

@@ -17,7 +17,7 @@
 #ifndef _MQTT_H_
 #define _MQTT_H_
 
-#include <iot/mqtt_types.h>
+#include <net/mqtt_types.h>
 #include <net/net_context.h>
 
 /**

include/iot/http_parser.h renamed to include/net/http_parser.h

@@ -1,2 +1 @@
 obj-y += libc/
-obj-y += iot/

include/iot/mqtt.h renamed to include/net/mqtt.h

@@ -19,6 +19,4 @@ menu "Cryptography"
 source "lib/crypto/tinycrypt/Kconfig"
 endmenu
 
-source "lib/iot/Kconfig"
-
 source "lib/libc/Kconfig"

include/iot/mqtt_types.h renamed to include/net/mqtt_types.h

@@ -13,5 +13,3 @@ endif
 else
 ZEPHYRINCLUDE += -I$(srctree)/lib/libc/minimal/include
 endif
-
-include $(srctree)/lib/iot/Makefile