Update git submodules

* Update docs/submodules/sdnc/oam.git from branch 'master'
  to 6a42d5eee5d71870527c8a302308f3e49829a496
  - Topology Discovery and optical-service DGs
    to support MDONS usecase
    
    Change-Id: I1c28e799cc83325e8913d17ee8b718b0a4160cb2
    Issue-ID: SDNC-928
    Signed-off-by: Franklin Dsilva <franklin.dsilva@us.fujitsu.com>
    
1 file changed