This commit fix random issues found with functionnal tests where the client
was refuse by the storage, because the latter was not fully initialized,
but never tried to reconnect to it if no other storages were available.

The main change introoduced is the availability of 'iterateForObject'
method on ConnectionPool. It allow iterate over potential node connections
for a given object id with the ability of waiting for the node to be ready
if not. It includes the common pattern that retreive the cell list,
randomize then sort them and never returns a None value, which suppose that
the outer loop must check if at least one iteration happens, for example.

Also included:
- getPartitionTable is now private because the connection needs it
- Deletion of _getCellListFor*
- Fixed tests
- New tests for ConnectionPool.iterateForObject

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So that search and add in connection_dict is made in the same method.

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This fixes cases where storage tries to answer a request after executing
queued events. This cannto happen with current code, but will happen in
near future.

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This is not used currently, and prevents method argument extension.

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This prevents doing pop(0)/insert(0, ...) needlessly on the first item.

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- Pop queued transaction from the beginning instead of end
- Restore test for begin with a tid
- Add test to check transactions unlocking mechanism
- Add/fix comments

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- add missing status parameter
- tabs are evil
- use sys.exit instead of raising KeyboarInterrupt (it raises SystemExit)

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The "data" parameter was meant to be used as an opaque type, but as
"forget" method needs to know its structure, stop pretending it's opaque.
This simplifies dispatch arguments a little bit.

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Also, factorise refcount code.

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Hotshot profiling shows FIFO.head() is called very often (~300k times for
embedded test suite). This change showed a ~30% speed increase for tested
case.

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It updates self._size, so we must read it from there each time.
This also uses the history queue, which was ignored by this code, hence
this should make better use of MQ algorithm.

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undoLog doesn't work when first is non-zero, this breaks iterator and
cannot be fixed for undoLog at the moment.

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This query happens when a storage node joins the cluster, to delete all
rows belonging to partitions it is not assigned to (ex: storage was down
and partition table was reorganised before it rejoined cluster).

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