Fix rare "error 2062" failure in various tests

Summary:
WebScaleSQL Feature: Basic Test Fixes

Occasionally, wait_until_connected_again will fail with error 2062,
when its supposed to continue to retry.

This adds that error to its list of acceptable errors while retrying.

Note: If it never successfully reconnects, the test will still fail,
so this does not hide any actual errors.  It just removes some false
test failures.

Test Plan:
Jenkins

The stress tests suite found this bug, but the problem is not
specific to those tests.

Reviewers: pivanof, darnaut, inaam-rana, jeremycole

Reviewed By: jeremycole

Subscribers: CalvinSun, jtolmer

Differential Revision: https://reviews.facebook.net/D23607

Author: jtolmer

mysql-test/include/wait_until_connected_again.inc

@@ -10,7 +10,7 @@ while ($mysql_errno)
   # Strangely enough, the server might return "Too many connections"
   # while being shutdown, thus 1040 is an "allowed" error
   # See BUG#36228
-  --error 0,1040,1053,2002,2003,2006,2013
+  --error 0,1040,1053,2002,2003,2006,2013,2062
   show status;
 
   dec $counter;