Flaky test: Integration test failure on Windows: TestJSONFileLoggerWithOpts

[anusha-ragunathan]

https://jenkins.dockerproject.org/job/Docker-PRs-WoW-RS1/20312/console

21:04:56 --- FAIL: TestJSONFileLoggerWithOpts (0.00s) 21:04:56 	jsonfilelog_test.go:170: open C:\Users\ContainerAdministrator\AppData\Local\Temp\docker-logger-216840801\container.log.1: The process cannot access the file because it is being used by another process. 21:04:56 FAIL

cc @johnstep

[olljanat]

RS1 failed to this on #38500 too:

03:54:41 --- FAIL: TestJSONFileLoggerWithOpts (0.03s)
03:54:41     jsonfilelog_test.go:187: open C:\Users\ContainerAdministrator\AppData\Local\Temp\docker-logger-037895817\container.log.1: The process cannot access the file because it is being used by another process.

[thaJeztah]

Failure on RS5 on #39846 (https://ci.docker.com/public/blue/rest/organizations/jenkins/pipelines/moby/branches/PR-39846/runs/5/nodes/41/log/?start=0)

[2019-09-03T08:58:49.666Z] --- FAIL: TestJSONFileLoggerWithOpts (0.07s)
[2019-09-03T08:58:49.666Z]     jsonfilelog_test.go:187: open C:\Users\ContainerAdministrator\AppData\Local\Temp\docker-logger-344571653\container.log.1: The process cannot access the file because it is being used by another process.

[thaJeztah]

Reopening this one, as we're seeing this issue again (occasionally)