add a debug log line
add a debug log line

this could be useful in the future but we added it to debug a flaky
test. see [this
build](https://diego.ci.cf-app.com/teams/main/pipelines/main/jobs/units-mysql/builds/282)
for more info

Signed-off-by: Joachim Valdez <f4115f6bcd6858c277581a1d9da83b9914dce2c3@us.ibm.com>

cloudfoundry-incubator/bbs,cloudfoundry-incubator/bbs