remove basic ipv6 tests inherited from basic ipv4, since won't work due to attempt to assign  floating ipv4 to private ipv6

Change-Id: I91fa47e4fe3cadd41f5f989bb172960ae0dbfbdb
Merge pull request #33 from kshileev/remove-basic-ipv6

remove basic ipv6 tests inherited from basic ipv4, since won't work due ...