Provide vfs.ncsizefactor instead of hard-coding namecache ratio. Move debug.ncnegfactor to vfs.ncnegfactor [1]. Provide some descriptions for the namecache related sysctls [1].
Provide vfs.ncsizefactor instead of hard-coding namecache ratio.
Move debug.ncnegfactor to vfs.ncnegfactor [1].
Provide some descriptions for the namecache related sysctls [1].

Based on the submission by:	Rogier R. Mulhuijzen <drwilco drwilco net> [1]
MFC after:	2 weeks
X-MFC-note:	remove debug.ncnegfactor in HEAD after MFC

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