Add slack in the other direction as well

Otto Visserrequested to merge
timingFix into development

What does this MR do (summary)?

Fix api key login

What changes have you made (detailed)?

Allow also EXPIRY_TIME seconds of slack in the other direction; now a server with time 1 second off is already breaking login.

Does this MR meet the acceptance criteria?

  • The main application was run to make sure the server still runs without errors.
  • Tests were written to verify the behaviour of this code.
  • Javadoc and other comments were added to make the code understandable.
  • The code adheres to the style guidelines.

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