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unbundle: free temporary objects after use

Authored by joerg.sonnenberger.

Description

unbundle: free temporary objects after use

This reduces peak RSS for larger unbundle operations by ~30 Bytes per
changeset on AMD64. This can't be a direct delete for Python 2.7, so
reset the object instead and leave a comment.

The efilesset object can't be deleted as it is referenced by the local
onchangelog function and Python 2.7 rejects a delete on the existance of
a nested scope.

Differential Revision: https://phab.mercurial-scm.org/D9153