build: cleanup default includes

- "gsystem-local-alloc.h" and <gio/gio.h> are already included via
  "nm-default.h". No need to include them separately.

- include "nm-macros-internal.h" via "nm-default.h" and drop all
  explict includes.

- in the modified files, ensure that we always include "config.h"
  and "nm-default.h" first. As second, include the header file
  for the current source file (if applicable). Then follow external
  includes and finally internal nm includes.

- include nm headers inside source code files with quotes

- internal header files don't need to include default headers.
  They can savely assume that "nm-default.h" is already included
  and with it glib, nm-glib.h, nm-macros-internal.h, etc.

src/dhcp-manager/nm-dhcp-client.c

@@ -19,6 +19,9 @@
 
 #include "config.h"
 
+#include "nm-default.h"
+#include "nm-dhcp-client.h"
+
 #include <string.h>
 #include <sys/types.h>
 #include <sys/wait.h>
@@ -28,13 +31,10 @@
 #include <stdlib.h>
 #include <uuid/uuid.h>
 
-#include "nm-default.h"
 #include "NetworkManagerUtils.h"
 #include "nm-utils.h"
-#include "nm-dhcp-client.h"
 #include "nm-dhcp-utils.h"
 #include "nm-platform.h"
-#include "gsystem-local-alloc.h"
 
 typedef struct {
 	char *       iface;

src/dhcp-manager/nm-dhcp-dhclient-utils.c

@@ -19,18 +19,18 @@
 
 #include "config.h"
 
+#include "nm-default.h"
+#include "nm-dhcp-dhclient-utils.h"
+
 #include <string.h>
 #include <ctype.h>
 #include <arpa/inet.h>
 
-#include "nm-default.h"
-#include "nm-dhcp-dhclient-utils.h"
 #include "nm-dhcp-utils.h"
 #include "nm-ip4-config.h"
 #include "nm-utils.h"
 #include "nm-platform.h"
 #include "NetworkManagerUtils.h"
-#include "nm-macros-internal.h"
 
 #define CLIENTID_TAG            "send dhcp-client-identifier"
 

src/dhcp-manager/tests/test-dhcp-dhclient.c

@@ -20,18 +20,18 @@
 
 #include "config.h"
 
+#include "nm-default.h"
+
 #include <string.h>
 #include <unistd.h>
 #include <arpa/inet.h>
 
-#include "nm-default.h"
 #include "NetworkManagerUtils.h"
 #include "nm-dhcp-dhclient-utils.h"
 #include "nm-dhcp-utils.h"
 #include "nm-utils.h"
 #include "nm-ip4-config.h"
 #include "nm-platform.h"
-#include "nm-macros-internal.h"
 
 #include "nm-test-utils.h"