Update git submodules

* Update docs/submodules/msb/apigateway.git from branch 'master'
  to faabc5c70fd285d3698d45516841f99459a89bea
  - Fix API Gateway stage job
    
    Issue-ID: MSB-338
    Change-Id: I42c9787779a617da37fa7c1c7ca4d643eca791a5
    Signed-off-by: Huabing Zhao <zhaohuabing@gmail.com>
    
diff --git a/docs/submodules/msb/apigateway.git b/docs/submodules/msb/apigateway.git
index 18352a4..faabc5c 160000
--- a/docs/submodules/msb/apigateway.git
+++ b/docs/submodules/msb/apigateway.git
@@ -1 +1 @@
-Subproject commit 18352a47ee8f6e4fbb499dc1eee20587b1e53439
+Subproject commit faabc5c70fd285d3698d45516841f99459a89bea