Fix blanket exception rescue in ThreadPoolServer


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@668957 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/rb/lib/thrift/server.rb b/lib/rb/lib/thrift/server.rb
index 206a6c6..d5ed902 100644
--- a/lib/rb/lib/thrift/server.rb
+++ b/lib/rb/lib/thrift/server.rb
@@ -125,7 +125,7 @@
                   trans.close
                 end
               end
-            rescue Exception => e
+            rescue => e
               @exception_q.push(e)
             ensure
               @thread_q.pop # thread died!