pep8 compliance for test_ip6.py
pep8 compliance for test_ip6.py

Change-Id: If29a1eba3e7056903978de782c062589bec0137e
Signed-off-by: Neale Ranns <b9c0e9ef0223633bc2f318425f615cf5840a0be7@cisco.com>

chrisy/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp,milanlenco/vpp,milanlenco/vpp,FDio/vpp,vpp-dev/vpp,chrisy/vpp,milanlenco/vpp,milanlenco/vpp,FDio/vpp,milanlenco/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,milanlenco/vpp,vpp-dev/vpp,vpp-dev/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,vpp-dev/vpp,FDio/vpp,vpp-dev/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp