bitbake: bitbake: Handle BBMainException

Some error messages were lost because BBMainException was
inherited from bb.BBHandledException. When bb.BBHandledException
is processed error messages are not printed as they suppose to
be printed before raising this exception.

Stopped to inherit BBMainException from bb.BBHandledException.
Handled BBMainException in bin/bitbake and printed error message
to the stderr.

(Bitbake rev: c8e2a40c4e9865ebef9936d23644f2602a5c90f5)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/bin/bitbake

@@ -33,12 +33,15 @@ except RuntimeError as exc:
     sys.exit(str(exc))
 
 from bb import cookerdata
-from bb.main import bitbake_main, BitBakeConfigParameters
+from bb.main import bitbake_main, BitBakeConfigParameters, BBMainException
 
 if __name__ == "__main__":
     try:
         ret = bitbake_main(BitBakeConfigParameters(sys.argv),
                            cookerdata.CookerConfiguration())
+    except BBMainException as err:
+        print >>sys.stderr, err
+        ret = 1
     except bb.BBHandledException:
         ret = 1
     except Exception:

bitbake/lib/bb/main.py

@@ -39,7 +39,7 @@ from bb import cookerdata
 __version__ = "1.27.0"
 logger = logging.getLogger("BitBake")
 
-class BBMainException(bb.BBHandledException):
+class BBMainException(Exception):
     pass
 
 def get_ui(config):