Revert "poky: subtree update:b23aa6b753..ad30a6d470"

This reverts commit af5e4ef732faedf66c6dc1756432e9de2ac72988.

This commit introduced openbmc/openbmc#3720 and no solution has been
forthcoming. Revert until we can get to the bottom of this.

Change-Id: I2fb0d81eb26cf3dadb2f2abdd1a1bb7a95eaf03c
diff --git a/poky/bitbake/lib/bb/command.py b/poky/bitbake/lib/bb/command.py
index dd77cdd..f8c6a03 100644
--- a/poky/bitbake/lib/bb/command.py
+++ b/poky/bitbake/lib/bb/command.py
@@ -81,12 +81,8 @@
                 result = command_method(self, commandline)
             except CommandError as exc:
                 return None, exc.args[0]
-            except (Exception, SystemExit) as exc:
+            except (Exception, SystemExit):
                 import traceback
-                if isinstance(exc, bb.BBHandledException):
-                    # We need to start returning real exceptions here. Until we do, we can't
-                    # tell if an exception is an instance of bb.BBHandledException
-                    return None, "bb.BBHandledException()\n" + traceback.format_exc()
                 return None, traceback.format_exc()
             else:
                 return result, None