Yocto 2.4

Move OpenBMC to Yocto 2.4(rocko)

Tested: Built and verified Witherspoon and Palmetto images
Change-Id: I12057b18610d6fb0e6903c60213690301e9b0c67
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/import-layers/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.xml b/import-layers/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.xml
index d1ce43e..c721e86 100644
--- a/import-layers/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.xml
+++ b/import-layers/yocto-poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-fetching.xml
@@ -620,7 +620,9 @@
                         The Git Submodules fetcher is not a complete fetcher
                         implementation.
                         The fetcher has known issues where it does not use the
-                        normal source mirroring infrastructure properly.
+                        normal source mirroring infrastructure properly. Further,
+                        the submodule sources it fetches are not visible to the
+                        licensing and source archiving infrastructures.
                     </para>
                 </note>
             </para>