COSS Crash + WCCP while rebuilding

I'd like to propose the attached patches for squid.

The first is a config option for wccp2 to make squid wait until all
cache_dirs have finished rebuilding before squid will register itself with
WCCP. This will allow the rebuild to happen quickly, and avoid slow web
requests while the cache rebuilds.

The second is a trivial patch to the storeSwapMetaUnpack() function to make
it initialise a variable. This was causing crashes with COSS when the first
object in the buffer was broken.

Steven

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