Update git submodules

* Update docs/submodules/msb/apigateway.git from branch 'master'
  to fa02b7c7360676ee7a3e06a210b0e4bbc43a75a2
  - update version to 1.2.6-SNAPSHOT
    
    Issue-ID: MSB-463
    Signed-off-by: Huabing Zhao <zhao.huabing@zte.com.cn>
    Change-Id: I7c6a625bd3f3eb50522db70c3c832bcee8a653d8
    
1 file changed