bundlerepo: remove a variable alias
"parentrepo" and "repo" were the same thing and I don't see much
reason for it (unionrepo has similar structure and a similar alias but
there are two repos there so at least it makes a little more sense
there).
Differential Revision: https://phab.mercurial-scm.org/D4830
Added signature for changeset
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Added tag 4.7.2 for changeset
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