[Organization - Users] Create users with random password

[alexchiraples]

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Migrated from https://github.com/gov-ithub/auth-sso/issues/113
Originally created by @aoancea on Mon, 30 Jan 2017 19:04:31 GMT

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Business value

As an admin I want the system to be able to link a user which does not already have an account created. The system should be able to link it to the organization, generate a random password and inform him he has been associated with the organization successfully. This should be done through an email which also contains the auto generated password and possible link where he can login and change the password.

Possible scenarios would be:

• link single user
• link multiple users - used for importing multiple ones
• user management is being done from a 3rd party Api which imports one or more users

We might also need to think about password expiry date in case of auto-generated password.