bitbake: tinfoil: Add shutdown method

One drawback to tinfoil is that once a cooker is created, it will hold
the cooker lock and stop any other bitbake execution against a directory.

Add a shutdown method to tinfoil, allowing other users to use
the build directory after the tinfoil usage is no longer needed.

(Bitbake rev: e44ce85fe551677fc0dcc1da4f789a0c13093ff1)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/tinfoil.py

@@ -84,6 +84,10 @@ class Tinfoil:
             else:
                 self.parseRecipes()
 
+    def shutdown(self):
+        self.cooker.shutdown(force=True)
+        self.cooker.unlockBitbake()
+
 class TinfoilConfigParameters(ConfigParameters):
 
     def __init__(self, **options):