reset deferral counter before finalising update

[cornevandyk]

The current script doesn't reset the deferral counter. This causes the behaviour that, if ever a new desiredOS is set in the XML file, the update will be forced immediately, since the deferral counter is already at the limit.

This PR resets the deferral counter to 0 as late as possible before finalising the update, so that any future updates will also allow deferrals.

[vmwclabot]

@cornevandyk, you must sign every commit in this pull request acknowledging our Developer Certificate of Origin before your changes are merged. This can be done by adding Signed-off-by: John Doe <john.doe@email.org> to the last line of each Git commit message. The e-mail address used to sign must match the e-mail address of the Git author. Click here to view the Developer Certificate of Origin agreement.

• Commit fd779bb530c15653ee24368bcf79e94dcd7343ad must be signed by corne.vandyk@jumo.world

[vmwclabot]

@cornevandyk, you must sign every commit in this pull request acknowledging our Developer Certificate of Origin before your changes are merged. This can be done by adding Signed-off-by: John Doe <john.doe@email.org> to the last line of each Git commit message. The e-mail address used to sign must match the e-mail address of the Git author. Click here to view the Developer Certificate of Origin agreement.

• Commit 351a87e0d2b59e72cdd1d271998317d03494f993 must be signed by corne.vandyk@jumo.world

[vmwclabot]

@cornevandyk, you must sign every commit in this pull request acknowledging our Developer Certificate of Origin before your changes are merged. This can be done by adding Signed-off-by: John Doe <john.doe@email.org> to the last line of each Git commit message. The e-mail address used to sign must match the e-mail address of the Git author. Click here to view the Developer Certificate of Origin agreement.

• Commit 60f3b4a036d8a0c3c43641e69c5cd725298819e4 must be signed by corne.vandyk@jumo.world