[ELY-2547] Add Elytron Tool option to overwrite CLI script

[lvydra]

Re-apply the changes for https://issues.redhat.com/browse/ELY-2547

[lvydra]

@darranl Well, it seems that FileSystemEncryptRealmCommandTes.testOverwritingScriptFileTrue is intermittently failing. I will try to tweak it.

[fjuma]

@lvydra Looks like this is still flaky on CI.

[lvydra]

@fjuma @darranl Please rerun the tests to confirm if the changes are stable.

[darranl]

Last run was green, running again for stability.

[fjuma]

Last run was green, running again.

[fjuma]

@lvydra Just so we can reference this later on if needed, would you be able to add a quick comment about the intermittent failure and how it was fixed?

[lvydra]

Sure @fjuma . In FileSystemEncryptRealmCommandTest I have been using File.lastModified() method to check if the file has been modified, but as I have found out later this method does not always return the latest value on Windows probably due to the file attributes caching.
So I switched to assertion based on file content.