nodes.py: autogenerate hostname if not set in nodefile

nodes.py

@@ -5,3 +5,7 @@ nodes = {}
 for node in Path(join(repo_path, "nodes")).rglob("*.py"):
     with open(node, 'r') as f:
         exec(f.read())
+
+for name, data in nodes.items():
+    if 'hostname' not in data.keys():
+        data['hostname'] = '.'.join(reversed(name.split('.'))) + '.kunbox.net'

nodes/htz-cloud/pirmasens.py

@@ -1,5 +1,4 @@
 nodes['htz-cloud.pirmasens'] = {
-    'hostname': '195.201.90.143',
     'bundles': [
     ],
     'metadata': {

nodes/htz/ex42-1048908.py

@@ -1,5 +1,4 @@
 nodes['htz.ex42-1048908'] = {
-    'hostname': '94.130.52.224',
     'bundles': [
         'nginx',
         'riot-web',