Fix some bugs and general brain damage in mounttab:

- Declare mtabhead as an extern in mounttab.h and define it only in
  mounttab.c.
- Remove shared global `verbose' and instead pass it as a parameter.
- Remove the `mtabp' argument to read_mtab(). It served no purpose
  whatsoever, although read_mtab() did use it as a temporary local
  variable.
- Don't check for impossible conditions when parsing mounttab, and
  do detect zero-length fields.
- Correctly test for strtoul() failures - just testing ERANGE is wrong.
- Include a field name in syslog errors, and avoid passing NULL to
  a syslog %s field.
- Don't test if arrays are NULL.
- If there are duplicates when writing out mounttab, keep the last
  entry instead of the first, as it will have a later timestamp.
- Fix a few formatting issues.

Update rpc.umntall and umount to match the mounttab interface changes.

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