Admin can send join link to new instructors

Professor @damithc  Yes it is not applicable anymore because:
1. Previously when adding a new instructor we would input the google ID and we used this to check whether this was a duplicated account with the same google ID. 
2. But now we simply send a email to the requester (a real account will not be created until the requester click on the verifying link) and the requester can sign in with any Google ID he wants and to use that ID as his entry account into the system.
3. We cannot use the email to check for duplication because a requester can have two requests for two new accounts and have the verification emails of both sent to the same email address.