Changed the minimum length of the username field

to two characters

iam-login-service/src/main/webapp/resources/iam/apps/registration/registration.html

@@ -110,7 +110,7 @@ <h2 class="text-center">
                 ng-class="{'has-error': rc.fieldInvalid('username'), 'has-success': rc.fieldValid('username')}">
                 <label class="control-label" for="username">Username</label>
                 <input class="form-control" id="username" name="username" type="text" ng-model="request.username"
-                    placeholder="Choose a username" required ng-minlength="3" iam-username-available-validator
+                    placeholder="Choose a username" required ng-minlength="2" iam-username-available-validator
                     ng-model-options="{ debounce : { 'default' : 500 } }" ng-readonly="rc.fieldReadonly('username')" />
                 <span class="help-block"
                     ng-show="registrationForm.username.$dirty && registrationForm.username.$error.required">