config file and command parser

[tcatm]

• There should be a config file.
• There should be a command interface.
• Both share the same set of commands. The config file is, essentially, a script.

At the very least, these commands are required:

• attach-mesh-interface
• detach-mesh-interface
• attach-client-interface
• detach-client-interface
• add-prefix
• remove-prefix
• set-export-table

[christf]

• config file can be parsed
• infrastructure to parse the data is still missing