gjournal feature-complete beta version

[Artemiev Igor]

> Any feedback is welcome! :)
Journal's creation:  "gjournal label -m journal -o speed var ad0s1e ad2s1"  - successfull 

fstab record:
/dev/journaled/var /var ufs rw 0 0

Then, during the load:
GEOM_JOURNAL[0]: Creating device var (id=3981633216).
GEOM_JOURNAL[0]: Device var created (id=3981633216). Mode=journal, Optimization=
speed.
GEOM_JOURNAL[0]: Worker thread for var created
GEOM_JOURNAL[0]: Adding disk ad2 to var.
GEOM_JOURNAL[0]: Disk ad2 attached to var (journal).
GEOM_JOURNAL[0]: Adding disk ad0s1 to var.
GEOM_JOURNAL[0]: Disk ad0s1 attached to var (data).
GEOM_JOURNAL[0]: Device var activated.
GEOM_JOURNAL[0]: Adding disk ad0s1c to var.
GEOM_JOURNAL[0]: Cannot add disk ad0s1c to var (error=17).
GEOM_JOURNAL[0]: Adding disk ad0s1e to var.
GEOM_JOURNAL[0]: Cannot add disk ad0s1e to var (error=17).
Trying to mount root from ufs:/dev/ad0s1a
GEOM_JOURNAL[0]: g_journal_remove_disk: Disk ad0s1 (data) removed from var.
GEOM_JOURNAL[0]: Adding disk ad0s1e to var.
GEOM_JOURNAL[0]: Disk ad0s1e attached to var (data).
GEOM_JOURNAL[0]: Device var activated.
GEOM_JOURNAL[0]: g_journal_remove_disk: Disk ad0s1e (data) removed from var.

/dev/journaled/var was not created
Was tested on 6-BETA2 и 7-CURRENT

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