Update git submodules

* Update docs/submodules/vfc/nfvo/driver/vnfm/svnfm.git from branch 'master'
  to 189d775690532a69c882902116d6f5572b157f0e
  - Add serializer for Subscribe
    
    Change-Id: Iea14a6d0852bef83959499160b8e22f7403e0228
    Issue-ID: VFC-1307
    Signed-off-by: fujinhua <fu.jinhua@zte.com.cn>
    
1 file changed