Fix python-opencontrail-vrouter-netns dependency

  * Wrap and sort dependency
  * Fix architecture flag of python-opencontrail-vrouter-netns
  * Fix dependency of python-opencontrail-vrouter-netns

Change-Id: I9b2eb93637e154423a7b402a186331b55c762d2f
(cherry picked from commit da624b851b78a4d092aec373ac4dc452b67f03d8)
Merge "Fix python-opencontrail-vrouter-netns dependency" into R1.10