largefiles: convert EOL of hgrc before appending to bytes IO Text IO is useless on Python 3 as it must be a unicode stream.

share: convert EOL of hgrc before writing to bytes IO Text IO is useless on Python 3 as it must be a unicode stream.

subrepo: convert EOL of hgrc before writing to bytes IO Follows up f2f0a777b2e2. Text IO is useless on Python 3 as it must be a unicode stream.

clone: use utility function to write hgrc

share: use context manager or utility function to write file

lfs: migrate most file filtering from threshold to custom filter Migrate `lfs.threshold` to more powerful `lfs.filter` added by D4990618 so people can specify what files to be stored in LFS with more flexibility. This patch was authored by Jun Wu for the fb-experimental repo, to avoid using matcher for efficiency[1]. All I've changed here is to register the new 'lfs.track' default so that the tests run cleanly, and adapt the subsequent language changes. Migrating the remaining uses of 'lfs.threshold' can be done separately since there's a fallback in place. [1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-December/109388.html