init: use `get_clone_path` when suitable

`hg init` has this weird feature were you can refer to `[paths]` entry select the path to initialize. We move that code to the new APIs.

Differential Revision: https://phab.mercurial-scm.org/D10418

mercurial/commands.py

@@ -4376,7 +4376,8 b' def init(ui, dest=b".", **opts):'
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
-    peer = hg.peer(ui, opts, ui.expandpath(dest), create=True)
+    path = urlutil.get_clone_path(ui, dest)[1]
+    peer = hg.peer(ui, opts, path, create=True)
     peer.close()