vswitch: Give up hope that the config file delimiter will be changed.

vswitch: Give up hope that the config file delimiter will be changed.

This code originally assumed that it could iterate over all the subsections
of "port" in the configuration file to obtain the names of network devices,
but this didn't work because "." is both the configuration file section
delimiter and a valid (and fairly common) character in network device
names.  So it was changed to use a different technique with the hope that
the original code could be restored when the configuration file syntax was
changed.

Now we've agreed that the configuration file syntax is not going to change
before we change to a different configuration model entirely, so this
commit deletes the original code (which was #if'd out, not deleted).

Another reason to do this is to kill off some warnings due to unused
functions and variables.