This patch looks bigger than it is. It does 2 things. 1). Renames smbpid -> smblctx...

This patch looks bigger than it is. It does 2 things. 1). Renames smbpid -> smblctx in our locking code. 2). Widens smblctx to 64-bits internally. Preparing to use the SMB2 handle as the locking context.

Jeremy.