Min timeout for Verify requests is now 15

[SecondeJK]

This PR changes the minimum timeout for Verify to be 15 seconds.

Description

See tests for ranges permitted.

Motivation and Context

API change that is backwards compatible.

How Has This Been Tested?

Test suite updated.

Example Output or Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.