clear errors of previous failed login attempts (#7516)

When the first login attempt is failed(due to incorrect secretkey)
and the next attempt is successful. Error message shown for
the previous attempts should go away.

Fixes #7514

browser/app/js/browser/Login.js

@@ -48,7 +48,7 @@ export class Login extends React.Component {
 
   handleSubmit(event) {
     event.preventDefault()
-    const { showAlert, history } = this.props
+    const { showAlert, clearAlert, history } = this.props
     let message = ""
     if (this.state.accessKey === "") {
       message = "Access Key cannot be empty"
@@ -66,6 +66,9 @@ export class Login extends React.Component {
         password: this.state.secretKey
       })
       .then(res => {
+        // Clear alerts from previous login attempts
+        clearAlert()
+
         history.push("/")
       })
       .catch(e => {
@@ -145,4 +148,7 @@ const mapDispatchToProps = dispatch => {
   }
 }
 
-export default connect(state => state, mapDispatchToProps)(Login)
+export default connect(
+  state => state,
+  mapDispatchToProps
+)(Login)