sysfs channels: cleanup device files handling

* Shortcut CLASS_DEV_CREATE/CLASS_DEV_DESTROY. No need to pass repetitive
  data (and NULL) on every call.

* Create/remove fixed device files (ctl, timer, channel, pseudo) via
  generic code (fixed_devfiles_create()/fixed_devfiles_remove()) instead
  of repetitive code and flags.

* Try to make all removal/cleanup functions idempotent, so we can
  safely call them on any failure without the need for multiple goto
  destinations.

* Rename 'device_state_flags' to 'should_cleanup' and its member
  flags to a better/consistent naming.

* Rename dahdi_sysfs_exit() to dahdi_sysfs_cleanup() and call it from
  a new proper dahdi_sysfs_exit()

* In dahdi_sysfs_init(), handle dahdi_sysfs_chan_init() failures

* Add dahdi_dbg() message before creating/removing all DEVICES
  objects.

* Also move two KERN_INFO messages to a more correct locations:
  - The version reporting should be first (in dahdi-base.c)
  - The "Telephony... on major" reporting should be at the end
    of dahdi_sysfs_init()

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

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@10464 a0bf4364-ded3-4de4-8d8a-66a801d63aff

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