Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to b6fc1fc1f2e4242a83a52581b7d6d05c7a7cd201
  - Merge "Encryption and decryption of OpenStack Passwords removed"
  - Encryption and decryption of OpenStack Passwords removed

    Description from Jira ticket:

    Current way of passing OpenStack password to SO is to
    encrypt it with a symmetric key that can be find in both
    OOM repo and source code. This means that the key is already
    compromised and this additional encryption does not introduce
    any additional security layer. Additionally this creates a fake
    security feeling for people who are not very familiar with the
    cryptography as they may think that their password is safe because
    it has been encrypted.

    Instead of using some custom-made method of passing this password
    please just use a secret and pass it via environment variable
    unencrypted
    and just never store it in a config file

    Issue-ID: SO-2535
    Change-Id: Iaad50d7d22fe0fc1e3f7e8c5c5cd3a788d777574
    Signed-off-by: Dominik Mizyn <d.mizyn@samsung.com>