oxenstored: blame the connection that caused a transaction conflict

oxenstored: blame the connection that caused a transaction conflict

Blame each connection found to have made a commit that would cause this
transaction to fail. Each blamed connection is penalised by having its
conflict-credit decremented.

Note the change in semantics for the replay function: we no longer stop after
finding the first operation that can't be replayed. This allows us to identify
all operations that conflicted with this transaction, not just the one that
conflicted first.

Signed-off-by: Jonathan Davies <jonathan.davies@citrix.com>
Signed-off-by: Thomas Sanders <thomas.sanders@citrix.com>
v1 Reviewed-by: Christian Lindig <christian.lindig@citrix.com>

Changes since v1:
 * use correct log levels for informational messages
Changes since v2:
 * fix the blame algorithm and improve logging
   (fix was reviewed by Jonathan Davies)

Signed-off-by: Thomas Sanders <thomas.sanders@citrix.com>