AMZL-02-710343: regular expression needs to account for variable lenght whitespace

[Mark-Kozak]

This control is failing due to more white space in the regex than allowed for. Adding a * between Defaults and timestamp gets the control to pass.
Change: it { should match /^[^#].*Defaults timestamp_timeout=\d/ }
To: it { should match /^[^#].*Defaults *timestamp_timeout=\d/ }

Editing the sudoers file to remove the additional spaces would also work, but that is unnecessary work that would need to be repeated for every new image. Fixing the control test is preferred.