Fixing the NetworkHelperImpl class. It was throwing a NPE due to a hypervisor type SIMULATOR not being in the hashmap.
When the refactor took place, we should have changed first structure, then behaviour. By refactoring the deployRouter method
we changed how the templateName was retrieved.
Fixed and tested using the simulator and the following Marvin tests

test_privategateway_acl
test_routers
test_vpc_vpn
test_service_offerings
test_volumes
test_reset_vm_on_reboot
test_multipleips_per_nic