style(metal): convert inventories from YAML to INI

We don't need to parse the inventories in Terraform anymore.
INI is easier to read and edit

metal/Makefile

@@ -4,17 +4,17 @@ default: boot cluster
 
 boot:
 	ansible-playbook \
-		--inventory inventories/prod.yml \
+		--inventory inventories/prod.ini \
 		main.yml
 
 cluster:
 	ansible-playbook \
-		--inventory inventories/prod.yml \
+		--inventory inventories/prod.ini \
 		cluster.yml
 
 shutdown:
 	ansible-playbook \
-		--inventory inventories/prod.yml \
+		--inventory inventories/prod.ini \
 		shutdown.yml
 
 lint:
@@ -23,5 +23,5 @@ lint:
 dev:
 	vagrant up
 	ansible-playbook \
-		--inventory inventories/dev.yml \
+		--inventory inventories/dev.ini \
 		cluster.yml

metal/inventories/dev.ini

@@ -0,0 +1,8 @@
+[metal:children]
+masters
+workers
+
+[masters]
+dev0 ansible_host=192.168.56.101
+
+[workers]

metal/inventories/dev.yml

@@ -1,5 +0,0 @@
-metal:
-  children:
-    masters:
-      hosts:
-        dev0: {ansible_host: 192.168.56.101}

metal/inventories/prod.ini

@@ -0,0 +1,11 @@
+[metal:children]
+masters
+workers
+
+[masters]
+metal0 ansible_host=192.168.1.110 mac='00:23:24:d1:f3:f0'
+metal1 ansible_host=192.168.1.111 mac='00:23:24:d1:f4:d6'
+metal2 ansible_host=192.168.1.112 mac='00:23:24:e7:04:60'
+
+[workers]
+metal3 ansible_host=192.168.1.113 mac='00:23:24:d1:f5:69'

metal/inventories/prod.yml

@@ -1,10 +0,0 @@
-metal:
-  children:
-    masters:
-      hosts:
-        metal0: {ansible_host: 192.168.1.110, mac: '00:23:24:d1:f3:f0'}
-        metal1: {ansible_host: 192.168.1.111, mac: '00:23:24:d1:f4:d6'}
-        metal2: {ansible_host: 192.168.1.112, mac: '00:23:24:e7:04:60'}
-    workers:
-      hosts:
-        metal3: {ansible_host: 192.168.1.113, mac: '00:23:24:d1:f5:69'}