Merge branch 'fix-pipeline-metrics-failure' into 'master'

Fix broken specs on MySQL

## What does this MR do?
Fixes broken master after https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6896

See merge request !6935

spec/workers/pipeline_metrics_worker_spec.rb

@@ -23,7 +23,7 @@ describe PipelineMetricsWorker do
       it 'records the build start time' do
         subject
 
-        expect(merge_request.reload.metrics.latest_build_started_at).to eq(pipeline.started_at)
+        expect(merge_request.reload.metrics.latest_build_started_at).to be_within(1.second).of(pipeline.started_at)
       end
 
       it 'clears the build end time' do
@@ -39,7 +39,7 @@ describe PipelineMetricsWorker do
       it 'records the build end time' do
         subject
 
-        expect(merge_request.reload.metrics.latest_build_finished_at).to eq(pipeline.finished_at)
+        expect(merge_request.reload.metrics.latest_build_finished_at).to be_within(1.second).of(pipeline.finished_at)
       end
     end
   end