bitbake: bb/main.py: fix infinite loop for --server-only

Fixed:
$ bitbake --server-only -B localhost:-1
Infinite loop
Reconnecting to bitbake server...
[snip]

Break the loop when server-only can fix the problem.

(Bitbake rev: c4d5c3dab5b35f3c6713efad1c8a23229ce4e56b)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/main.py

@@ -439,7 +439,7 @@ def setup_bitbake(configParams, configuration, extrafeatures=None, setup_logging
                         raise bb.server.process.ProcessTimeout("Bitbake still shutting down as socket exists but no lock?")
                 if not configParams.server_only:
                     server_connection = bb.server.process.connectProcessServer(sockname, featureset)
-                if server_connection:
+                if server_connection or configParams.server_only:
                     break
             except (Exception, bb.server.process.ProcessTimeout) as e:
                 if not retries: