Create function to validate PUT /user request body data

[isabelcosta]

Description

As a developer,
I need restrict character limit on fields that can be updated,
so that I can protect the backend from trying to save invalid data.

Solves bug reported on issue #96

Acceptance Criteria

Update

• Add a validation function to app/api/validations/user.py file
• Add tests to prove that the validation function is working properly. The test file can be called test_validation_update_profile.py inside folder tests/users
• Use this validation function in MyUserProfile class, funtion put() from file app/api/resources/user.py to validate the request data sent by the client is being verified
• Warning! make sure to strip strings before checking for the length!! fix this in the registration validation and add tests!

Definition of Done

• All of the required items are completed.
• PR should be sent to the gsoc18-code branch.
• Approval by 1 mentor.

Estimation

4 hours

[isabelcosta]

@sviho do you want to take on this issue and try to solve this? You can see in the Update section what you need to do. If you feel comfortable with python and this issue let me know, otherwise I can take of this.

[Dilu9218]

@isabelcosta you can do it. approved.