Update bin/web script to take into account linkerd-viz (#5442)

The `get-pod` and `port-forward` functions continue to assume
deployments like grafana still live under the `linkerd` namespace.
This expands the definition of those functions to be able to specify the
namespace.

These changes can be solely tested by running `bin/web dev` (follow the
instructions in `BUILD.md` for the preliminaries needed).

bin/web

@@ -17,7 +17,7 @@ USAGE: web <command>
   * integration (cloud|local) - run the integration tests
       Note: Sauce Connect tunnel must be open for cloud tests
   * port-forward - setup a tunnel to a controller component and port
-      Example: port-forward controller 8085
+      Example: port-forward linkerd controller 8085
   * run - run a local server (sans. reloading)
   * setup - get the environment setup for development
       Note: any command line options are passed on to yarn
@@ -27,8 +27,8 @@ USAGE
 }; function --help { '-h' ;}
 
 check-for-linkerd() {
-  controller_pod=$(get-pod controller)
-  grafana_pod=$(get-pod grafana)
+  controller_pod=$(get-pod linkerd controller)
+  grafana_pod=$(get-pod linkerd-viz grafana)
 
   if [[ -z "${controller_pod// }" ]]; then
     err 'Controller is not running. Have you installed Linkerd?'
@@ -59,25 +59,31 @@ build() {
 }
 
 get-pod() {
-  if [ $# -ne 1 ]; then
-    echo "usage: bin/${0##*/} get-pod component-name" >&2
+  if [ $# -ne 2 ]; then
+    echo "usage: bin/${0##*/} get-pod namespace component-name" >&2
     exit 1
   fi
 
-  kubectl --namespace=linkerd get po \
-    --selector=linkerd.io/control-plane-component="$1" \
+
+  selector="linkerd.io/control-plane-component=$2"
+  if [ "$1" == "linkerd-viz" ]; then
+    selector="component=$2"
+  fi
+
+  kubectl --namespace="$1" get po \
+    --selector="$selector" \
     --field-selector='status.phase==Running' \
     -o jsonpath='{.items[*].metadata.name}'
 }
 
 port-forward() {
-  if [ $# -ne 2 ]; then
-    echo "usage: bin/${0##*/} port-forward component-name port-number" >&2
+  if [ $# -ne 3 ]; then
+    echo "usage: bin/${0##*/} port-forward namespace component-name port-number" >&2
     exit 1
   fi
 
   nc -z localhost "$2" || \
-    kubectl --namespace=linkerd port-forward "$(get-pod "$1")" "$2:$2"
+    kubectl --namespace="$1" port-forward "$(get-pod "$1" "$2")" "$3:$3"
 }
 
 run() {
@@ -89,8 +95,8 @@ run() {
   build
 
   check-for-linkerd && (
-    port-forward controller 8085 &
-    port-forward grafana 3000 &
+    port-forward linkerd controller 8085 &
+    port-forward linkerd-viz grafana 3000 &
   )
 
   cd "$ROOT"/web && \