Simplify and make semantic way for form auth login submit config and usage

[jeevatkm]

The goal is to simplify and make it semantic way for form auth login submit config and usage.

Currently to make login submit flow to work, aah user have to manually have define/configure virtual route definition in routes.conf after configuring form auth scheme in security.conf

login_submit {
  path = "/login"
  method = "POST"
  controller = "VirtualFormController"
}

So v0.11.0 onwards -

• aah would read the security.conf and configure the route and its flow automatically and
• Getting form action URL via route name form_auth_login_submit__aah
  • Key format is <auth-scheme-name>_login_submit__aah

<form class="form-signin" method="post" action="{{ rurl . "form_auth_login_submit__aah" }}">

• [x] Implementation
• [x] Documentation update

[jeevatkm]

Documentation update is done 😄