Fix SSH settings on vagrant deployment

This works around a bug where ssh-ing to the first node to
pgrep for apt is broken because the initial call gets grabbed
by pgrep.

Also set unprivileged mode for kargo_deploy.sh invocation so that
it doesn't write root owned files in vagrant home directory.

Change-Id: I487fba3ed3529d23b0eaa4af63c9d14899cf5f95

Vagrantfile

@@ -63,14 +63,14 @@ Vagrant.configure("2") do |config|
           "KARGO_REPO"   => $kargo_repo,
           "KARGO_COMMIT" => $kargo_commit,
           "SLAVE_IPS"    => "\"#{node_ips.join(' ')}\"",
-          "ADMIN_IP"     => ip,
+          "ADMIN_IP"     => "local",
           "IMAGE_PATH"   => $box.sub('/','_'),
         }
         env = []
         vars.each { |k, v| env << "#{k}=#{v}" }
 
         deploy = with_env("/vagrant/utils/jenkins/kargo_deploy.sh", env)
-        config.vm.provision "shell", inline: "#{deploy}"
+        config.vm.provision "shell", inline: "#{deploy}", privileged: false
       end
     end
   end