Issue #538: Fixup for DE249 bugfix (issue #515)

Touch up this PR:
    https://github.com/rcbops-cookbooks/mysql-openstack/pull/49

This bug would only ever be triggered if the chef client exited
prematurely in the right place (which happened to me once :-)).
Merge pull request #64 from invsblduck/issue538_mysql

Merged automatically by jenkins after successful build test