make ip-fabric-forwarding and ip-fabric-snat features configurable

it is true by default which leads to sporadically non-working tests.
let's make it configurable and enabled by default. the tests
will disable it.

Change-Id: Icaa6a0724c100d93f04eeca5bf207daaed3a48c0

Author: Comrade88

kubernetes/manifests/contrail-dpdk-standalone-kubernetes.yaml

@@ -41,7 +41,8 @@ data:
   HUGE_PAGES: "{{ HUGE_PAGES }}"
   NIC_OFFLOAD_ENABLE: {{ NIC_OFFLOAD_ENABLE }}
   KAFKA_NODES: {{ KAFKA_NODES }}
-  KUBERNETES_IP_FABRIC_FORWARDING: "true"
+  KUBERNETES_IP_FABRIC_FORWARDING: "{{ KUBERNETES_IP_FABRIC_FORWARDING }}"
+  KUBERNETES_IP_FABRIC_SNAT: "{{ KUBERNETES_IP_FABRIC_SNAT }}"
   KUBERNETES_PUBLIC_FIP_POOL: "{{ KUBERNETES_PUBLIC_FIP_POOL }}"
   LOG_LEVEL: {{ LOG_LEVEL }}
   METADATA_PROXY_SECRET: {{ METADATA_PROXY_SECRET }}

kubernetes/manifests/contrail-standalone-kubernetes.yaml

@@ -26,7 +26,8 @@ data:
   CONFIGDB_NODES: {{ CONFIGDB_NODES }}
   CONTROL_NODES: {{ CONTROL_NODES }}
   CONTROLLER_NODES: {{ CONTROLLER_NODES }}
-  KUBERNETES_IP_FABRIC_FORWARDING: "true"
+  KUBERNETES_IP_FABRIC_FORWARDING: "{{ KUBERNETES_IP_FABRIC_FORWARDING }}"
+  KUBERNETES_IP_FABRIC_SNAT: "{{ KUBERNETES_IP_FABRIC_SNAT }}"
   KUBERNETES_PUBLIC_FIP_POOL: "{{ KUBERNETES_PUBLIC_FIP_POOL }}"
   LOG_LEVEL: {{ LOG_LEVEL }}
   METADATA_PROXY_SECRET: {{ METADATA_PROXY_SECRET }}

parse-env.sh

@@ -159,6 +159,8 @@ export CLOUD_ORCHESTRATOR=${CLOUD_ORCHESTRATOR:-'none'}
 
 export KUBERNETES_API_SERVER=${KUBERNETES_API_SERVER:-$HOST_IP}
 export KUBERNETES_API_SECURE_PORT=${KUBERNETES_API_SECURE_PORT:-'6443'}
+export KUBERNETES_IP_FABRIC_SNAT=${KUBERNETES_IP_FABRIC_SNAT:-'false'}
+export KUBERNETES_IP_FABRIC_FORWARDING=${KUBERNETES_IP_FABRIC_FORWARDING:-'true'}
 
 export DPDK_UIO_DRIVER=${DPDK_UIO_DRIVER:-'uio_pci_generic'}
 export CPU_CORE_MASK=${CPU_CORE_MASK:-'0x01'}