Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - [xci] integrate istio in XCI

    using kubespary to deploy the istio, kubespary support to deploy istio

    installer-type:kubespray
    deploy-scenario:k8-nosdn-istio

    Change-Id: Id8c04936187c89fafa921dada382a0e9e11aab27
    Signed-off-by: wutianwei <wutianwei1@huawei.com>
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index e1b1f28..e17c762 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit e1b1f28d3ad3224e518faa50a04e04bde51c4829
+Subproject commit e17c762bd13cab40a1a741ee3a9ac63db5612e4f