proxies: add smart proxy support

still to do:

* document new configuration options
* add smart proxies to groups view
* import bandwidth and CPU alarms

app/terraform/__init__.py

@@ -1,6 +1,8 @@
 from abc import ABCMeta, abstractmethod
 import os
-from typing import Tuple, Optional
+from typing import Tuple, Optional, Any
+
+import jinja2
 
 from app import app
 
@@ -34,3 +36,16 @@ class BaseAutomation(metaclass=ABCMeta):
             self.short_name or self.__class__.__name__.lower(),
             filename or ""
         )
+
+    def tmpl_write(self, filename: str, template: str, **kwargs: Any) -> None:
+        """
+        Write a Jinja2 template to the working directory for use by an automation module.
+
+        :param filename: filename to write to
+        :param template: Jinja2 template
+        :param kwargs: variables for use with the template
+        :return: None
+        """
+        tmpl = jinja2.Template(template)
+        with open(self.working_directory(filename), 'w') as tf:
+            tf.write(tmpl.render(**kwargs))