Bug fix in odl-sfc testcase
Bug fix in odl-sfc testcase

Test is stopping if the route to the VMs ip range is already there because
the command that adds that, exits with code 1 and set -e is activated.
Now it is checked if it is there and if not, the command is executed

Change-Id: I820a55aff2572aadcb1950fa9218b114a9058c57
Signed-off-by: Manuel Buil <ce05bb565e1eba801d179d3714a6bc52be6ccf49@ericsson.com>

opnfv/functest,opnfv/functest,mywulin/functest,mywulin/functest