[SEMANAGE] Separate file rw code from linked list

This patch separates the file dbase read (cache) and write (flush) code, from the linked list that's used when the records are in memory. There's several ways to do this, and this patch uses inheritance to do it - dbase_llist becomes the (abstract) parent, and dbase_file inherits from it, by routing the method table appropriately.

The reason for this is two-fold:
1) To allow re-use of the linked list dbase elsewhere... (like in a join implementation, or the policy server, or somewhere else).

2) To make it easier to implement another in-memory data structure in the future (like a hashtable).

I'm not entirely sure if this patch gets all the details right, but I think the general idea is on the right track - the representation in memory, and how the data gets there should be separate.

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