Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to f5a69be34850dc102c02514a8126e79f00226fa6
  - Merge changes I3e363f64,I52ec2fc9

    * changes:
      include a bak folder for obsolete files
      updated the doc as per the request

  - include a bak folder for obsolete files

    Issue-ID: SO-1230

    Signed-off-by: seshukm <seshu.kumar.m@huawei.com>
    Change-Id: I3e363f6445f6f76b62f0ca1bf9467fd795db50e7

  - updated the doc as per the request

    Issue-ID: SO-1230

    Signed-off-by: seshukm <seshu.kumar.m@huawei.com>
    Change-Id: I52ec2fc97abfd71b31a59fcb0416b0472e83d39c