Fix redirection to a given path after login

For instance:

1. Enter http://webui.demo.nuxeo.com/nuxeo/ui/?language=fr#!/browse/default-domain/workspaces/Specifications
2. Log in, you get redirected to http://webui.demo.nuxeo.com/nuxeo/ui/#!/browse/default-domain@view

This is because the #!/browse/default-domain/workspaces/Specifications part of the URL is not sent to the server, so HttpServletRequest#getRequestURI() doesn't fetch it in NuxeoAuthenticationFilter#saveRequestedURLBeforeRedirect.

We should find a way to handle such a redirection.

Yet if we find a way there will still be an issue in NuxeoAuthenticationFilter#saveRequestedURLBeforeRedirect:

        // avoid redirect if not useful
        if (requestPage.startsWith(LoginScreenHelper.getStartupPagePath())) {
            return true;
        }

Let's say that

requestPage = ui/#!/browse/default-domain@view

Since

LoginScreenHelper.getStartupPagePath() = "ui/"

the redirection won't occur.

This works with a jSF URL like

http://webui.demo.nuxeo.com/nuxeo/nxpath/default/default-domain/workspaces/Specifications@view_documents?tabIds=MAIN_TABS%3Adocuments%2C%3A

because nxpath doesn't start with nxstartup.faces.