[merge] deprecate LockableFiles.get_utf8

[Martin Pool]

As discussed some time ago, I want to remove LockableFiles, which is
present on most components as .control_files.  It has a mismash of
several functions which don't fit particularly well together, and make
some changes in Remote objects harder.

This is the first (and maybe easiest) patch: rather than using
.get_utf8(), callers just act on the transport directly.

At the moment Branch/Repository/Tree objects must have a .control_files
attribute, pointing to a LockableFiles.  I'll probably change that to
require them to have a ._transport instead.  We don't really want them
to need to expose a Transport, but at present they effectively do, as
.control_files._transport.  Once everything that does file-level
operations is going through the same interface we can clean up any
non-internal users of it.

-- 
Martin
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