Unable to deploy 2 egress routers to the same OpenShift node

Issue

• Cannot deploy two OpenShift egress routers to a single node. If a second egress pod is deployed (openshift3/ose-egress-router or openshift/origin-egress-router) on a node already running an egress pod, the second pod will fail to start with the error:

  Reason: Failed sync
  Message: Error syncing pod, skipping: failed to "SetupNetwork" for "egress-1_routing-demo2" with SetupNetworkError: "Failed to setup network for pod \"egress-1_routing-demo2(ea13b84a-ef1e-11e6-bed1-525400d3abb3)\" using network plugins \"redhat/openshift-ovs-multitenant\": Error running network setup script: + ip link add link eth0 name macvlan0 type macvlan mode private\nRTNETLINK answers: File exists\n; Skipping pod"