Fix parsing of displayName

Currently, we only have one field for the name. The first part is
first name. The rest is last name. Obviously, this won't work in all
cases but is the best we can do for the moment.

src/test/users-test.js

@@ -623,4 +623,18 @@ describe('User', function () {
             expect(result.length).to.be(0); // should have been removed by mandatory 2fa setting change
         });
     });
+
+    describe('parseDisplayName', function () {
+        it('parses names', function () {
+            const names = [
+                { in: 'James', out: { firstName: 'James', lastName: '', middleName: '' } },
+                { in: 'James Anderson', out: { firstName: 'James', lastName: 'Anderson', middleName: '' } },
+                { in: 'James Philip Anderson', out: { firstName: 'James', lastName: 'Philip Anderson', middleName: '' } },
+            ];
+
+            for (const name of names) {
+                expect(users.parseDisplayName(name.in)).to.eql(name.out);
+            }
+        });
+    });
 });