Merge lp:~percona-toolkit-dev/percona-toolkit/pt-mysql-summary-fails-on-cluster-node-in-Donor-or-Desynced-status-1402668 into lp:~percona-toolkit-dev/percona-toolkit/release-2.2.13

[Frank Cizmich]

problem:
when used on a node which is in status: "donor" or "desynced" tool fails when testing connection because it uses the test "select 1"

Although "select" doesn't work, "show status" does, and a lot of data can still be retrieved from that node.

solution:
simply changed connection test to "show status"

[Daniel Nichter (daniel-nichter)]

review: Approve

=== modified file 'bin/pt-mysql-summary'
--- bin/pt-mysql-summary	2014-11-11 13:28:27 +0000
+++ bin/pt-mysql-summary	2015-01-05 15:41:58 +0000
@@ -2397,7 +2397,7 @@
 
    # Now that we have the cmd line opts, check that we can actually
    # connect to MySQL.
-   [ -n "$(mysql $EXT_ARGV -e 'SELECT 1')" ] \
+   [ -n "$(mysql $EXT_ARGV -e 'SHOW STATUS')" ] \
       || die "Cannot connect to MySQL.  Check that MySQL is running and that the options after -- are correct."
 
 }