Switch to dynamic ansible inventory

We don't need to install and use kargo cli anymore.

nodes_to_inv.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+
+# A simple dynamic replacemant of 'kargo prepare'
+# Generates ansible inventory from a list of IPs in 'nodes' file.
+
+import argparse
+import json
+
+def read_nodes_from_file(filename):
+    f = open(filename, 'r')
+    content = [x.strip('\n') for x in f.readlines()]
+    return content
+
+def nodes_to_hash(nodes_list, masters):
+    nodes = {
+          'all': {
+              'hosts': [],
+          },
+          'etcd': {
+              'hosts': [],
+          },
+          'kube-master': {
+              'hosts': [],
+          },
+          'kube-node': {
+              'hosts': [],
+          },
+          'k8s-cluster': {
+              'children': ['kube-node', 'kube-master']
+          }
+        }
+
+    for node_ip in nodes_list:
+        nodes['all']['hosts'].append("%s" % node_ip)
+        nodes['kube-node']['hosts'].append("%s" % node_ip)
+        if i <= masters:
+            nodes['kube-master']['hosts'].append("%s" % node_ip)
+        if i <= 3:
+            nodes['etcd']['hosts'].append("%s" % node_ip)
+
+    return nodes
+
+def main():
+    parser = argparse.ArgumentParser(description='Ansible dynamic inventory')
+    parser.add_argument('--nodes', help='File with list of nodes, one IP per line', default='nodes')
+    parser.add_argument('--masters', type=int, help='Number of master nodes, will be taken from the top of list', default=2)
+    parser.add_argument('--list', action='store_true')
+    parser.add_argument('--host', default=False)
+    args = parser.parse_args()
+
+    nodes_list = read_nodes_from_file(args.nodes)
+
+    if len(nodes_list) < 3:
+        print "Error: requires at least 3 nodes"
+        return
+
+    nodes = nodes_to_hash(nodes_list, args.masters)
+
+    if args.host:
+        print "{}"
+    else:
+        print json.dumps(nodes)
+
+if __name__ == "__main__":
+    main()