Update buildroot & docker (#25)

* Update docker & buildroot

* Fix

* fix versions

buildroot/support/testing/infra/basetest.py

@@ -42,6 +42,7 @@ class BRTest(unittest.TestCase):
         self.testname = self.__class__.__name__
         self.builddir = self.outputdir and os.path.join(self.outputdir, self.testname)
         self.emulator = None
+        self.config += '\nBR2_DL_DIR="{}"\n'.format(self.downloaddir)
         self.config += "\nBR2_JLEVEL={}\n".format(self.jlevel)
 
     def show_msg(self, msg):
@@ -57,6 +58,7 @@ class BRTest(unittest.TestCase):
 
         if not self.b.is_finished():
             self.show_msg("Building")
+            self.b.configure()
             self.b.build()
             self.show_msg("Building done")