Vagrantfile: helpful VM name + fix ansible.inventory.path

This  makes it easier to identify the vm with `vagrant global-status`, to
find its image on disk, etc..

Also, move the ansible.inventory.path to be part of the provisioning
section, being in the general vm config section causes a vagrant error.

Vagrantfile

@@ -1,18 +1,20 @@
 Vagrant.require_version ">= 2.2.2"
 
 Vagrant.configure(2) do |config|
-  config.vm.box = "ubuntu/bionic64"
-  config.vm.network "private_network", ip: "172.30.1.5"
-  config.ssh.insert_key = false
-  ansible.inventory_path = "tests/inventories/integration_testing/inventory"
+  config.vm.define "ansible-nas-test" do
+    config.vm.box = "ubuntu/bionic64"
+    config.vm.network "private_network", ip: "172.30.1.5"
+    config.ssh.insert_key = false
 
-  config.vm.provision "ansible_local" do |ansible|
-    ansible.compatibility_mode = "2.0"
-    ansible.galaxy_role_file = "requirements.yml"
-    ansible.playbook = "nas.yml"
-    ansible.become = true
-    ansible.raw_arguments = [
-      "--extra-vars @tests/test.yml"
-    ]
+    config.vm.provision "ansible_local" do |ansible|
+      ansible.compatibility_mode = "2.0"
+      ansible.galaxy_role_file = "requirements.yml"
+      ansible.inventory_path = "tests/inventories/integration_testing/inventory"
+      ansible.playbook = "nas.yml"
+      ansible.become = true
+      ansible.raw_arguments = [
+        "--extra-vars @tests/test.yml"
+      ]
+    end
   end
 end