[MERGE] (robertc) Cap the amount of data we write in a single IO during local path pack operations to fix bug 255656. (Robert Collins)

[Robert Collins]

This fixes a bug in autopack with windows & SMB mounted drives.

Simply, the file.write(bytes) call was failing when bytes was 80MB in
size.

No explicit test for this, but I can shelve it and come back later if
needed.

-Rob


-- 
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