Fix two deadlocks in snapshots:

1) Release the snapshot file lock while suspending the system. Otherwise
   a process trying to read the lock may block on its containing directory
   preventing the suspension from completing. Thanks to Sean Kelly
   <smkelly@zombie.org> for finding this deadlock.

2) Replace some bdwrite's with bawrite's so as not to fill all the
   buffers with dirty data. The buffers could not be cleaned as the
   snapshot vnode was locked hence the system could deadlock when
   making snapshots of really massive filesystems. Thanks to
   Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp> for figuring
   this out.

Sponsored by:   DARPA & NAI Labs.

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