Fixed issue with custom topology file.
The file was not being copied on mininet vm by the test. It
was expected to be present there. This fix would copy the file.
Also changed custom topology file to a newer script.

Change-Id: I1072c348ec8bc66e8cf5d7d1466019e869cbcdf6
Signed-off-by: Amit Mandke <ammandke@cisco.com>
Merge "Fixed issue with custom topology file. The file was not being copied on mininet vm by the test. It was expected to be present there. This fix would copy the file. Also changed custom topology file to a newer script."