Properly initialize the capability rights for vnodes exported to procstat
that aren't for file descriptors (cwd, jdir, tracevp, etc.).

Submitted by:	Mikhail <mp@lenta.ru>


git-svn-id: svn+ssh://svn.freebsd.org/base/head@274970 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f