Remove deprecated Fission Nats connector (#2403)

We are removing Fission deprecated Nats connector and
planning to adopt Keda going forward to have better
delegated functionality and more rich support.

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

tools/port-forward-nats.sh

@@ -1,23 +0,0 @@
-#!/bin/bash
-
-namespace=$1
-if [ -z "$namespace" ]
-then
-    namespace=fission
-fi
-
-svc=$1
-if [ -z "$svc" ]
-then
-    svc=nats-streaming
-fi
-
-port=$2
-if [ -z "$port" ]
-then
-    port=8888
-fi
-
-kubectl get pods -l svc=$svc -o name --namespace $namespace | \
-        sed 's/^.*\///' | \
-        xargs -I{} kubectl port-forward {} $port:$port -n $namespace &