Update git submodules

* Update docs/submodules/msb/swagger-sdk.git from branch 'master'
  to 76b75128fcadb55910d1f61d49e81e1bf6725bfb
  - update version to 1.2.6-SNAPSHOT
    
    Issue-ID: MSB-463
    Signed-off-by: Huabing Zhao <zhao.huabing@zte.com.cn>
    Change-Id: I6fd5846b58716ad997155f6919f52147a68a432f
    
1 file changed