Would like to get rid of "import board" from the file docsis.py

[mbanders]

The class docsis in this file takes mibs_paths as a parameter, but currently no caller actually does that. I'm willing to change every call to pass in mibs_paths so that we can remove the import board here:

        from devices import board
        if mibs_paths is None and hasattr(board, 'mibs_paths'):
            default = os.path.expandvars('/home/$USER/.snmp/mibs:/usr/share/snmp/mibs:/usr/share/snmp/mibs/iana:/usr/share/snmp/mibs/ietf:/usr/share/mibs/site:/usr/share/snmp/mibs:/usr/share/mibs/iana:/usr/share/mibs/ietf:/usr/share/mibs/netsnmp')
            mibs_path_arg = "-M "  + default

            for mibs_path in board.mibs_paths:
                mibs_path_arg = mibs_path_arg + ":" + mibs_path

            self.mibs_path_arg = mibs_path_arg

Basically we need to avoid importing dynamic things - things that can change.

[mattsm]

mibs_path should be constructed by each board type, so we can simply pass this value to the docsis class

just want to be sure we don't have the tests creating this each time, over and over, but just do it once per device.