Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to e9c0b88ed9b0e9a538ee87f25f3ea4c99f853702
  - Fix dependency failure for aai-schema
    
    Issue-ID: SO-2636
    Signed-off-by: Enbo Wang <wangenbo@huawei.com>
    Change-Id: I946870c801134dc76b8c55ffd52ace5aaef60a69
    
1 file changed