remotenames: introduce a class to lazily resolve remotnames remotenames may take time to load and in next patch we are going to introduce namespaces related to them. So let's introduce a class making them load lazily. This is a part of moving hgremotenames extension to core. hgremotenames: https://bitbucket.org/seanfarley/hgremotenames Differential Revision: https://phab.mercurial-scm.org/D1757

local test passed
addgroupcopy test passed
clone test passed
lowlevelcopy test passed