libnetutils: Rename dhcptool to dhcpdbg

Also print warning that IP will not allow full connectivity.

Test: Manual

Change-Id: I264c478f07236108a01e766c5264897c2000f008
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>

libnetutils/Android.bp

@@ -19,7 +19,7 @@ cc_library_shared {
 }
 
 cc_binary {
-    name: "dhcptool",
+    name: "dhcpdbg",
 
     srcs: [
         "dhcptool.c",

libnetutils/dhcptool.c

@@ -40,7 +40,7 @@ int main(int argc, char* argv[]) {
     if (rc) {
         err(errno, "dhcptool %s: do_dhcp failed", interface);
     }
-
+    warn("IP assignment is for debug purposes ONLY");
     ifc_close();
 
     return rc ? EXIT_FAILURE : EXIT_SUCCESS;