todo: ssh master connection

Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>

doc/dev/todo/post-1.0

@@ -2,6 +2,8 @@ Core:
    - Support singletons (see types/issue for a good reason)
    - extend cdist_tree_wrapper to look for optional/mandority parameters for types
       - gives "good" database, which contains only valid objects
+   - use ssh with master socket?
+      - saves connection delay for new connections: -M
 
 Type handler:
    - add dependency parameters to core available for every type
@@ -22,3 +24,4 @@ Types to be written:
       - add_line_to_file_if_not_existing
       - delete_line_from_file
       - regexp replace (can probably cover all?)
+