Revert "changed Client::ShardedOperationScope to respect recursion #797"

This reverts commit c57f7979487df10c0b596dfc8b488d960db0c77a.
Revert "added rwlock to ShardingState #797"

This reverts commit 60f372a6863f3a2556a667b2094f4a954c760ade.
Merge branch 'master' of github.com:Tokutek/mongo