Make automount(8)/automountd(8) treat percent sign as a valid part
of path.  It's useful for spaces encoded as %20 as msdosfs labels.

Submitted by:	glebius@
MFC after:	1 month


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273107 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f