1. Replaced function call rc_util.update_state with rc_util.certify_account
2. Added callback function for certify_account

1. Set a valid set of eppa values
2. Check if user's attributes match with any of the valid set of eppa values
3. If no match with user's eppa and valid set, redir to shib error page

Feat account renewal1

See merge request !1

2. Sending to error page of eppa not valid

removed hard-coded value

See merge request rc/self-reg-form!9

added flask-cors and used allow cross_allowed_origins to fix the issue seen on prod cluster (400 CORS error)

made UI changes to the app

See merge request rc/self-reg-form!8

sending text message for welcome message, error message and cancel message as a variable from messages.py