bitbake: fetch2/hg.py: add clean function

Fixed when bitbake vim -ccleanall:

File: '/path/to/bitbake/lib/bb/fetch2/__init__.py', lineno: 1462, function: clean
     1458:    def clean(self, urldata, d):
     1459:        """
     1460:        Clean any existing full or partial download
     1461:        """
 *** 1462:        bb.utils.remove(urldata.localpath)
     1463:
     1464:    def try_premirror(self, urldata, d):
     1465:        """
     1466:        Should premirrors be used?
File: '/path/to/bitbake/lib/bb/utils.py', lineno: 633, function: remove
     0629:        subprocess.call(['rm', '-rf'] + glob.glob(path))
     0630:        return
     0631:    for name in glob.glob(path):
     0632:        try:
 *** 0633:            os.unlink(name)
     0634:        except OSError as exc:
     0635:            if exc.errno != errno.ENOENT:
     0636:                raise

Exception: OSError: [Errno 21] Is a directory: '/path/to/downloads/hg/vim.googlecode.com/hg/vim'

(Bitbake rev: 02763306662e15a4750395e5eab64ba98d1f9939)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/hg.py

@@ -163,6 +163,11 @@ class Hg(FetchMethod):
         logger.debug(1, "Running %s", updatecmd)
         runfetchcmd(updatecmd, d)
 
+    def clean(self, ud, d):
+        """ Clean the hg dir """
+
+        bb.utils.remove(ud.localpath, True)
+
     def supports_srcrev(self):
         return True