remotefilelog: remove some BC code related to streamclone
Since remotefilelog is now moved to core and we have
streamclone._walkstreamfiles() in core, we don't need to have the backward
compatibility code.
People with old mercurial version should use remotefilelog from hg-experimental
repo as IMO remotefilelog will go under a good refactoring and old clients will
break.
# no-check-commit foo_bar function name
Differential Revision: https://phab.mercurial-scm.org/D5189
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