Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "refactor static_path to accomodate web portal"
  - refactor static_path to accomodate web portal

    move tornado_swagger/static to opnfv_testapi/static
    move swagger related 3rd libs to 3rd_party/swagger

    Change-Id: I32bba10584c99d13687b93f32577e37581db0c63
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 8952b1d..26215c7 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 8952b1d73c5ac50f7267c89a19ab83b6664fade5
+Subproject commit 26215c783dd2eb900eb0e987bd9b3b850c05e3fe