.arcconfig

remotenames: add names argument to remotenames revset

This patch adds names argument to the revsets provided by the remotenames
extension. The revsets are remotenames(), remotebranches() and
remotebookmarks(). names can be a single names, list of names or can be empty too
which means it's an optional argument.

If names is/are passed, changesets which have those remotenames will be
returned.
If names are not passed, changesets from all the remotenames are shown.

Passing an invalid remotename does not throw error.

The name argument also supports pattern matching.

Tests are added for the argument in tests/test-logexchange.t

Differential Revision: https://phab.mercurial-scm.org/D3639

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