Clean exit in time command

The time command now catch the ccli exception and KeyboardInterrupt and
print the execution time before a clean exit.

cccli/commands/time.py

@@ -21,14 +21,21 @@ class Command_time(Command):
         Command.__init__(self, cli, argv0)
 
     def __call__(self, argv):
-        if len(argv) > 1:
-            # Substitute aliases
-            self.args = self.cli.aliases.substitute(argv[1:])
-            # Init time
-            t0 = systime.time()
+        if len(argv) < 2:
+            raise cmdBadArgument()
+        # Substitute aliases
+        self.args = self.cli.aliases.substitute(argv[1:])
+        # Init time
+        t0 = systime.time()
+        try:
             # Execute command
             self.cli.commands(self.args)
+        except KeyboardInterrupt:
+            raise
+        except cliException:
+            raise
+        finally:
             t1 = systime.time()
-            # Get elapsed time
+            # Compute elapsed time
             dt = int(t1 - t0)
-            print "Execution time: %s" % datetime.timedelta(seconds=dt)
+            self.printer.out("Execution time: %s" % datetime.timedelta(seconds=dt))