MFC r253114:

MFC r253114:

  Send per-namespace logpage commands to the controller devnode, so they
  are processed as admin commands, not I/O commands.

  As part of this change, pull out the code for parsing a namespace node
  string into a separate function, since it is used for both identify and
  logpage commands.

Approved by:	re (kib)

git-svn-id: svn://svn.freebsd.org/base/stable/9@253300 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f