bundlerepo: assign bundle attributes in bundle type blocks
It is a bit wonky to assign the same object to multiple
attributes and then possibly overwrite them later.
Refactor the code to use a local variable and defer attribute
assignment until the final values are ready.
This required passing the bundle instance to _handlebundle2part().
The only use of this method I could find is Facebook's
treemanifest extension. Since it is a private method, I don't
think it warrants an API callout.
Differential Revision: https://phab.mercurial-scm.org/D1378
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