Add script to demo weave in vagrant

scripts/example_weave.bash

+#!/bin/bash
+if [[ "$USER" != "vagrant" ]]; then
+    echo "WARNING: This script is intended to be run from Nomad's Vagrant"
+    read -rsp $'Press any key to continue anyway...\n' -n1 key
+fi
+
+set -e
+
+if [[ ! -a /usr/local/bin/weave ]]; then
+    echo "Installing weave..."
+    sudo curl -L git.io/weave -o /usr/local/bin/weave
+    sudo chmod a+x /usr/local/bin/weave
+fi
+weave launch || echo "weave running"
+eval $(weave env)
+
+if curl -s localhost:8500 > /dev/null; then
+    echo "Consul running"
+else
+    echo "Running Consul dev agent..."
+    consul agent -dev > consul.out &
+fi
+
+if curl -s localhost:4646 > /dev/null; then
+    echo "Nomad running"
+else
+    echo "Running Nomad dev agent..."
+    nomad agent -dev > nomad.out &
+fi
+
+sleep 5
+
+echo "Running Redis with Weave in Nomad..."
+cat > redis-weave.nomad <<EOF
+job "weave-example" {
+  datacenters = ["dc1"]
+  type = "service"
+
+  group "cache" {
+    count = 1
+
+    task "redis" {
+      driver = "docker"
+      config {
+        image = "redis:3.2"
+        port_map {
+          db = 6379
+        }
+
+        # Use Weave overlay network
+        network_mode = "weave"
+      }
+
+      resources {
+        cpu    = 500 # 500 MHz
+        memory = 256 # 256MB
+        network {
+          mbits = 10
+          port "db" {}
+        }
+      }
+
+      # By default services will advertise the weave address
+      service {
+        name = "redis"
+        tags = ["redis", "weave-addr"]
+        port = "db"
+
+        # Since checks are done by Consul on the host system, they default to
+        # the host IP:Port.
+        check {
+          name     = "host-alive"
+          type     = "tcp"
+          interval = "10s"
+          timeout  = "2s"
+        }
+
+        # Script checks are run from inside the container, so you can use
+        # environment vars to get the container ip:port.
+        check {
+          name     = "container-script"
+          type     = "script"
+          command  = "/usr/local/bin/redis-cli"
+          args     = ["-h", "\${NOMAD_DRIVER_IP_db}", "-p", "\${NOMAD_DRIVER_PORT_db}", "QUIT"]
+          interval = "10s"
+          timeout  = "2s"
+        }
+      }
+
+      # Setting address_mode = "host" will create a service entry with the
+      # host's address.
+      service {
+        name = "host-redis"
+        tags = ["redis", "host-addr"]
+        port = "db"
+        address_mode = "host"
+      }
+    }
+  }
+}
+EOF
+
+nomad run redis-weave.nomad