Logfile endpoint cannot be disabled using the standard property

[yalov4uk]

Currently in the project spring-boot-actuator-autoconfigure 2.1.3 there is no way to declaratively disable logfile endpoint if logging.file property exists.
So this PR is created to logfile actuator behave as other actuators.
And while i was fixing tests I had noticed that the test's method name was "logFileWebEndpointCanBeDisabled" whereas it tests bean creation.

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[snicoll]

@yalov4uk good catch, looks like the base condition was missed since day one!

[snicoll]

@yalov4uk thank you very much for your first contribution to Spring Boot. I've backported a fix to 2.1.x and merged your contribution to master.

[snicoll]

Actually the tests are not working anymore and I forgot to re-run them when looking at master

[yalov4uk]

From the logs i cannot determine the problem.

[snicoll]

From the logs i cannot determine the problem.

@yalov4uk you don't need to wait for CI to figure out the problem. Building the module or running that test from your IDE should have shown you the test failures.