Occasional SQL error in tests

[nijel]

There is an occasional SQL error in test suite, for example in travis build 80 only one has shown it:

https://travis-ci.org/phpmyadmin/error-reporting-server/jobs/27663799

But others have not:

https://travis-ci.org/phpmyadmin/error-reporting-server/jobs/27663800
https://travis-ci.org/phpmyadmin/error-reporting-server/jobs/27663798
https://travis-ci.org/phpmyadmin/error-reporting-server/jobs/27663797

This needs to be debugged further and also it's unclear why this error does not fail the test.

[nijel]

I've upgraded CakePHP in cfbf34b and it seems to help, or at least I was no longer able to reproduce this bug, but let's leave it open for a while in case it shows up again.