Update git submodules

Update git submodules

* Update docs/submodules/sdnc/oam.git from branch 'master'
  to a3603b522c83ffd8e8cfc0f6451697dc89a5a9a3
  - Bug fixing in topology discovery as part of CCVPN (Cross-Layer Cross-Domain VPN) use-case.

    1. Cross-layer tp-ttp relationship update.
    2. Save te-link-attribute and label-restriction and relationship between them.
    3. Add 3rd party controller id into network-id to make it unique for cross-domain use case.
    4. Calling Base64 converter plugin to convert inter-domain-plug-id

    Issue-ID: SDNC-899
    Signed-off-by: Hesam Rahimi <hesam.rahimi@huawei.com>
    Change-Id: I892249f8197ceb0e2d32b35a521fdbb1b833010c