[keycloak-dev] Make the application context path available on the HttpFacade

Hi ! While trying to fix https://issues.jboss.org/browse/KEYCLOAK-4342 I realized that I need to have the application context path. The fix is for the CookieTokenStore, it's failing currently when no application context is set (for instance a Spring Boot or WF Swarm app running directly under localhost:8080). (details are in the ticket) I was hoping to rely on this method getRelativePath(); https://github.com/keycloak/keycloak/blob/master/adapters/spi/adapter-spi... but for the Undertow implementation for instance , it returns an empty string. So, we could add a seperate method on the HttpFacade (or the KeycloakDeployment object) that returns the application context path, it's not trivial since it needs to be added to all the adapter implementations. WDYT ? Sebi