[PATCH] main: Ensure exceptions are correctly displayed

[Richard Purdie <richard.purdie@linuxfoundation.org>]

If the cooker fails to start, ensure a correct exception is displayed to the
user. After handling any queued events simply re-raise the original exception
else the output can be unclear.

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

diff --git a/lib/bb/main.py b/lib/bb/main.py
index a287905..b296ef8 100755
--- a/lib/bb/main.py
+++ b/lib/bb/main.py
@@ -336,7 +336,6 @@ def start_server(servermodule, configParams, configuration, features):
         server.addcooker(cooker)
         server.saveConnectionDetails()
     except Exception as e:
-        exc_info = sys.exc_info()
         while hasattr(server, "event_queue"):
             import queue
             try:
@@ -345,7 +344,7 @@ def start_server(servermodule, configParams, configuration, features):
                 break
             if isinstance(event, logging.LogRecord):
                 logger.handle(event)
-        raise exc_info[1], None, exc_info[2]
+        raise
     server.detach()
     cooker.lock.close()
     return server