Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to bdb527826000c1ab7e832b2bf5fd188f72e3bfb9
  - Merge "Upgrate the out-of-date link in virtlet test"
  - Upgrate the out-of-date link in virtlet test

    The fedora 29 image link is out of date. It is not reachable now.
    So upgrade the link to fedora 31.

    Issue-ID: MULTICLOUD-1057
    Signed-off-by: Yao Le <le.yao@intel.com>
    Change-Id: I5f384cb906bf080c55ea4ea2a27b1514722c8b76

diff --git a/docs/submodules/multicloud/k8s.git b/docs/submodules/multicloud/k8s.git
index a25e24c..bdb5278 160000 (submodule)
--- a/docs/submodules/multicloud/k8s.git
+++ b/docs/submodules/multicloud/k8s.git
@@ -1 +1 @@
-Subproject commit a25e24c34e4b0e42513bc00de7d97185a49a01fe
+Subproject commit bdb527826000c1ab7e832b2bf5fd188f72e3bfb9