added tests to user model spec around validating the user against LDAP at creation
added tests to user model spec around validating the user against LDAP at creation

prakash-alpine/chorus,jamesblunt/chorus,hewtest/chorus,hewtest/chorus,hewtest/chorus,atul-alpine/chorus,atul-alpine/chorus,prakash-alpine/chorus,lukepolo/chorus,hewtest/chorus,atul-alpine/chorus,hewtest/chorus,jamesblunt/chorus,hewtest/chorus,atul-alpine/chorus,lukepolo/chorus,jamesblunt/chorus,jamesblunt/chorus,atul-alpine/chorus,lukepolo/chorus,lukepolo/chorus,lukepolo/chorus,hewtest/chorus,atul-alpine/chorus,jamesblunt/chorus,atul-alpine/chorus,prakash-alpine/chorus,jamesblunt/chorus,jamesblunt/chorus,lukepolo/chorus,prakash-alpine/chorus,lukepolo/chorus,hewtest/chorus,prakash-alpine/chorus