[Cooker] reiserfs fixes from 2.4.9-ac14

[Borsenkow Andrej]

Sounds sweet:

o Clean up reiserfs flags usage (Nikita Danilov) 
o Fix reiserfs disk leak on crash case (Nikita Danilov) 
o Fix reiserfs mount option handling (Nikita Danilov) 
o Cosmetic reiserfs changes (Nikita Danilov)