Configfile (#559)

Add cdist configuration/config file support.

cdist/exec/remote.py

@@ -62,7 +62,8 @@ class Remote(object):
                  remote_copy,
                  base_path=None,
                  quiet_mode=None,
-                 archiving_mode=None):
+                 archiving_mode=None,
+                 configuration=None):
         self.target_host = target_host
         self._exec = remote_exec
         self._copy = remote_copy
@@ -73,6 +74,10 @@ class Remote(object):
             self.base_path = "/var/lib/cdist"
         self.quiet_mode = quiet_mode
         self.archiving_mode = archiving_mode
+        if configuration:
+            self.configuration = configuration
+        else:
+            self.configuration = {}
 
         self.conf_path = os.path.join(self.base_path, "conf")
         self.object_path = os.path.join(self.base_path, "object")
@@ -235,7 +240,10 @@ class Remote(object):
 
         """
 
-        command = [os.environ.get('CDIST_REMOTE_SHELL', "/bin/sh"), "-e"]
+        command = [
+            self.configuration.get('CDIST_REMOTE_SHELL', "/bin/sh"),
+            "-e"
+        ]
         command.append(script)
 
         return self.run(command, env, return_output)