kernel - Add many sysctl definitions, sysv, vfs, nfs, etc.

kernel - Add many sysctl definitions, sysv, vfs, nfs, etc.

* Also take the opportunity to remove some dead (no longer referenced
  sysctl's), these are:
  vfs.cache.dothits
  vfs.cache.dotdothits
  vfs.cache.nummiss
  vfs.cache.nummisszap
  vfs.cache.numposzaps
  vfs.cache.numposhits
  vfs.cache.numnegzaps
  vfs.cache.numneghits
  vfs.reassignbufloops
  vfs.reassignbufsortgood
  vfs.reassignbufsortbad
  vfs.reassignbufmethod
  vfs.nfs.defect
  vfs.cache.numfullpathfail4
  vfs.cache.numfullpathfail3
  vfs.cache.numfullpathfail2
  vfs.cache.numfullpathfail1
  vfs.cache.numcwdfail4
  vfs.cache.numcwdfail3
  vfs.cache.numcwdfail2
  vfs.cache.numcwdfail1

* Add back a couple of vfs.cache sysctl's with improved names
  vfs.cache.numcwdfailnf
  vfs.cache.numcwdfailsz
  vfs.cache.numfullpathfailnf
  vfs.cache.numfullpathfailsz

Submitted-by: Taras Klaskovsky
Sponsored-by: Google Code-In