Extra forward slash added to gateway-http URL

Issue

If the contextPath has been added to the io.fabric8.gateway.http.mapping-apis:

PID: io.fabric8.gateway.http.mapping-apis
  uriTemplate {contextPath}
  zooKeeperPath /fabric/registry/clusters/apis

Notice the extra slash on the "service path", which in some cases (e.g. REST services) can cause a 404 error:

2017-01-27 09:11:21,265 | INFO  | entloop-thread-0 | HttpGatewayHandler               | 139 - io.fabric8.gateway-core - 1.2.0.redhat-630187 | Proxying request /cxf/crm?_wadl to service path: /cxf/crm//?_wadl on service: http://my.local:8183/cxf/crm reverseServiceUrl: http://0.0.0.0:9000/cxf/crm