User authenication broken in 5.7.1.3 - email validation

Issue

• I am unable to login to my 5.7.1.3 appliance using LDAP. It gives an error of "Validation failed: Email must be a valid email address"
• The email address that LDAP returns has upper case characters and therefore I can not login.
• The email validation is no longer accepting upper case characters in the users email address.
• Users that have a single quote in their email address cannot login in.
• Lost LDAP authentication after 4.2 upgrade
• LDAP authentication not working
• Active Directory login not working
• unable to find user object in LDAP
• Not updating Azure cloud provider after initial configuration