xpp: sysfs access cleanups

With /proc/xpp code removed, some cleanup can be done.

* No need to search alternative attribute names, so xbus_attr_path() is
  redundant.

* Don't compose xbus sysfs directory in multiple code locations.
  Do it once in Xbus->new() and use the result ($xbus->sysfs_dir)

* Pass XPD directory strings directly to Xpd->new()
  - So we parse it for unit/subunit only in Xpd->new()

* Don't parse xbus sysfs name:
  - Toplevel scan, pass it as is to Xbus->new()
  - Xbus->new() deduce the xbus->num from the naming
    of Xpd's inside (nn:m:k) -- this is a hack until
    we add xbus number as an xbus sysfs attribute

Signed-off-by: Oron Peled <oron.peled@xorcom.com>
Acked-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/tools/trunk@10494 a0bf4364-ded3-4de4-8d8a-66a801d63aff

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