Create users which can set the password themselves

[joerghoh]

It would be great to have a feature which creates a user but then triggers the password reset functionality in AEM so the user can set his/her own password.

Of course if the actool runs again for the 2nd time, the account is not locked and the user is not required to reset the password again.

(AEM already provides a bit of this functionality, although the overall documentation could be improved: https://helpx.adobe.com/experience-manager/6-2/sites/developing/using/reference-materials/javadoc/com/adobe/cq/account/api/AccountManagementService.html)

[kwin]

This is related to #307