Update git submodules

* Update docs/submodules/msb/apigateway.git from branch 'master'
  to da0d0b23b3380f1777c1779b4adc44573eaa0055
  - Release RC1
    
    Certificate in MSB is set to use *.zte.com.cn
    
    Issue-ID: MSB-467
    Signed-off-by: Huabing Zhao <zhao.huabing@zte.com.cn>
    Change-Id: I81c630c4ab4b053120edc9f2da3ca33843055e6f
    
diff --git a/docs/submodules/msb/apigateway.git b/docs/submodules/msb/apigateway.git
index 7d188a0..da0d0b2 160000
--- a/docs/submodules/msb/apigateway.git
+++ b/docs/submodules/msb/apigateway.git
@@ -1 +1 @@
-Subproject commit 7d188a04973f23c64102ac9ec5f4804344be1b49
+Subproject commit da0d0b23b3380f1777c1779b4adc44573eaa0055