changegroup: inline ellipsisdata()
There's only one caller of it. I don't think it needs to exist as
a standalone function.
Differential Revision: https://phab.mercurial-scm.org/D4074
To run the tests, do:
cd tests/
python run-tests.py
See https://mercurial-scm.org/wiki/WritingTests for
more information on writing tests.