Update git submodules

* Update docs/submodules/kvmfornfv from branch 'stable/danube'
  - Update documentation structure.

    This patch includes adjusting docs directory structure for kvmfornfv
    project.

    Change-Id: Ic2f992cd5e8f6808ca3ba088172eb6da342182ba
    Signed-off-by: Gundarapu Kalyan Reddy <reddyx.gundarapu@intel.com>

diff --git a/docs/submodules/kvmfornfv b/docs/submodules/kvmfornfv
index b04935b..8815494 160000 (submodule)
--- a/docs/submodules/kvmfornfv
+++ b/docs/submodules/kvmfornfv
@@ -1 +1 @@
-Subproject commit b04935b08394a9b64b69429215e27f0323065bfa
+Subproject commit 8815494ebba1bbb37ab0a9f9700f5dfb33cf12fb