Fix dynamic vcache / rxmaxmtu cmd id collision

Fix dynamic vcache / rxmaxmtu cmd id collision

Both dynamic vcaches and rxmaxmtu had been committed as using the
35th command entry. Fix this according to the order they are in
the command list (35 and 36, respectively). Tidy up the command list
so it's easier to read, and remove the #ifdef notdef entry from it,
as adding it back in would just cause chaos.

Change-Id: I3fce403aa0ab01c42f0e1a48ae401503b0e21c24
Reviewed-on: http://gerrit.openafs.org/740
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>