Bug:tosca.nodes.nfv.CP definition is error

Bug:tosca.nodes.nfv.CP definition is error

 1、The virtualLink requirement of tosca.nodes.nfv.CP defined below:
     - virtualLink:
         capability: tosca.capabilities.VirtualLinkable
   But the tosca.capabilities.VirtualLinkable does not exsit in simple
   tosca(which is tosca.capabilities.Linkable), it should be
   tosca.capabilities.nfv.VirtualLinkable in nfv tosca.

   Additonally, the attribute definition of IP_address in CP is not
   needed because the parent node type tosca.nodes.network.Port
   also includes the same attributes ip_address.

 2、The bug will be submitted to openstack community.

JIRA:PARSER-32

Change-Id: I8f70747675dd6623380493d0436d9516c545d705
Signed-off-by: shangxdy <shang.xiaodong@zte.com.cn>