Support multiple VMs in Vagrant config

environments/development.json

@@ -6,9 +6,6 @@
   "default_attributes": {
   },
   "override_attributes": {
-    "kosmos-parity": {
-      "debian_package_dir": "/vagrant"
-    },
     "kosmos-mastodon": {
       "elasticsearch": {
         "allocated_memory": "128m"
@@ -18,6 +15,8 @@
       "master_hostname": "localhost"
     },
     "bitcoin": {
+      "username": "vagrant",
+      "usergroup": "vagrant",
       "conf": {
         "testnet": 1,
         "irc": 1,