Revert "Added a version requirement to openvswitch (1.6.1-1) in wakame-vdc's rpm spec file"

This reverts commit addec64e839d0761a380c59cbbc8ad51668fa42f.
Merge pull request #244 from axsh/revert-PR240

Revert "Added a version requirement to openvswitch (1.6.1-1) in wakame-v...