Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to a606609968f186f15f6a37d4c81d8254407f7f42
  - Merge "Replace String Literal with a Constant"
  - Replace String Literal with a Constant
    
    Replace String Literals with Constant MsoVnfAdapterAsyncImpl class
    
    Issue-ID: SO-1490
    
    Change-Id: Iaf8519e6ec216bf8e79e56e76856019b50371616
    Signed-off-by: Sindhuri.A <arcot.sindhuri@huawei.com>
    
1 file changed