Remove unused name

[joubbi]

It's possible to have IP addresses shown as names in the running-configuration (and ASDM).
I have configurations with many rows of names not used in access-lists or other parts of the configuration.
It would be nice to clean these the same way as the object-groups.

Example:

name 192.168.0.10 mail-server
name 10.0.0.3 domain_controller3 description Windows DC3
name 192.168.0.124 another_server