os.Environment: Add method conf_value()

Since all command instances carry config information from
~/.jw-devtestrc, make it available via a dedicated conf_value()
method to all interested test cases.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/devtest/os/Environment.py

@@ -2,6 +2,7 @@
 
 from .Connections import Connections
 from jwutils import Options
+from jwutils.log import *
 
 class Environment:
 
@@ -12,6 +13,10 @@ class Environment:
         self.features = Options(args.features)
         for spec in args.connection:
             self.connections.append(spec)
+        slog(INFO, "Features = {}".format(self.features))
+
+    def conf_value(self, path, default=None):
+       return self.cmd.conf_value(path, default)
 
     @property
     def eloop(self):