kernel-devsrc: extend to provide all kernel source

* Add bbappend to re-write do_install to provide all kernel
  source, so it will:
  - Fix issues that dpdk fails to build in container.
  - Extend the ability of the recipe so it can rebuild kernel

* And add kernel-devsrc to image.

Issue-ID: INF-116
Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Change-Id: I20ab8c622bcbbfe2a8e5068dae5cb5fef5321dd8
diff --git a/scripts/configs/local-stx.conf b/scripts/configs/local-stx.conf
index 605c098..44cb5aa 100644
--- a/scripts/configs/local-stx.conf
+++ b/scripts/configs/local-stx.conf
@@ -13,6 +13,10 @@
     package-management \
 "
 
+IMAGE_INSTALL_append = " \
+    kernel-devsrc \
+"
+
 # For anaconda installer
 DISTRO_FEATURES_append = " anaconda-support"