Deprecate unmaintainable uses of strncmp to implement abbreviations.

This commit replaces those with two new functions that simplify the code
and produce warnings that the syntax is deprecated.  A small number of
sensible abbreviations may be explicitly added based on user feedback.

There were previously three types of strncmp use in ipfw:
 - Most commonly, strncmp(av, "string", sizeof(av)) was used to allow av
   to match string or any shortened form of it.  I have replaced this
   with a new function _substrcmp(av, "string") which returns 0 if av
   is a substring of "string", but emits a warning if av is not exactly
   "string".

 - The next type was two instances of strncmp(av, "by", 2) which allowed
   the abbreviation of bytes to "by", "byt", etc.  Unfortunately, it
   also supported "bykHUygh&*g&*7*ui".  I added a second new function
   _substrcmp2(av, "by", "bytes") which acts like the strncmp did, but
   complains if the user doesn't spell out the word "bytes".

 - There is also one correct use of strncmp to match "table(" which might
   have another token after it without a space.

Since I changed all the lines anyway, I also fixed the treatment of
strncmp's return as a boolean in many cases.  I also modified a few
strcmp cases as well to be fully consistent.

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