Update git submodules

* Update docs/submodules/sdnc/oam.git from branch 'master'
  to 15c6cfe1990346af373968693fd7c568003bea11
  - Merge "Fix sdwan-vf-vpn-delete DG by passing vf-module-id"
  - Fix sdwan-vf-vpn-delete DG by passing vf-module-id
    
    Vf-module-id is passed as it is not passed and
    returned Missing key is getVfModuleId.
    
    Change-Id: I576f6fd11b97aa1af423837bcd741abc653a2803
    Issue-ID: SDNC-659
    Signed-off-by: Prakash.E <prakash.e@huawei.com>
    
1 file changed