Extend IPv4 Routing test coverage

[taraschornyiplv]

https://github.com/dentproject/testing/pull/150 https://github.com/dentproject/testing/pull/149 https://github.com/dentproject/testing/pull/147 https://github.com/dentproject/testing/pull/146 https://github.com/dentproject/testing/pull/145 https://github.com/dentproject/testing/pull/93 https://github.com/dentproject/testing/pull/148 https://github.com/dentproject/testing/pull/130