Update git submodules

* Update kubernetes/robot from branch 'master'
  to a8e1918a02156ecec86409948d400669c2e67bb7
  - Adapt CLI healthcheck test for HTTPS

    CLI provided a new docker version fixing the security issue
    consisting in exposing HTTP public port
    The code of the associated healthcheck must be updated

    Issue-ID: INT-1501

    Signed-off-by: mrichomme <morgan.richomme@orange.com>
    Change-Id: I0b66afa3d77be490ddf914d3a0cc3adae0636da0

diff --git a/kubernetes/robot b/kubernetes/robot
index 656326e..a8e1918 160000 (submodule)
--- a/kubernetes/robot
+++ b/kubernetes/robot
@@ -1 +1 @@
-Subproject commit 656326e3073f9f8fd4139bb1e585722d8025cb75
+Subproject commit a8e1918a02156ecec86409948d400669c2e67bb7