fetch, fetch2: Get rid of DeprecationWarning notice

* This patch fixes a cosmetic issue currently we get with master

WARNING: /home/kraj/work/bitbake/lib/bb/fetch2/__init__.py:733:
DeprecationWarning: Call to deprecated function bb.mkdirhier: Please use bb.utils.mkdirhier instead.  bb.mkdirhier("%s/%s" % (rootdir, destdir))

(Bitbake rev: 36fe59ce314c295d239b76de34c8714def2c32d5)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/osc.py

@@ -96,7 +96,7 @@ class Osc(FetchMethod):
             oscfetchcmd = self._buildosccommand(ud, d, "fetch")
             logger.info("Fetch " + loc)
             # check out sources there
-            bb.mkdirhier(ud.pkgdir)
+            bb.utils.mkdirhier(ud.pkgdir)
             os.chdir(ud.pkgdir)
             logger.debug(1, "Running %s", oscfetchcmd)
             bb.fetch2.check_network_access(d, oscfetchcmd, ud.url)