Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 8c26ced50d7ad4528d123d217e543c8a5fd6db98
  - Merge "add new functionality to aai client"
  - add new functionality to aai client

    Remove only the first occurrence of parentUri from uriTemplate.
    add createIfNotExists to transaction clients
    moved classes to generic GraphInventory location
    removed unused interfaces from graphinventory client
    refactored all graph inventory clients

    Change-Id: I2b946674ff92c44d33fff2f327e96655ed5c0195
    Issue-ID: SO-1501
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@us.att.com>