This is my configuration (Debian):

<VirtualHost *:80>
        ServerAdmin webmaster@localhost
        ServerName laravel.local
        DocumentRoot /var/www/laravel/public
        <Directory />
                Options FollowSymLinks
                AllowOverride all
        </Directory>
        <Directory /var/www/laravel/public>
                #Options Indexes FollowSymLinks MultiViews
                Options FollowSymlinks -MultiViews
                AllowOverride all
                Order allow,deny
                allow from all
        </Directory>


        ErrorLog ${APACHE_LOG_DIR}/laravel-error.log

        # Possible values include: debug, info, notice, warn, error, crit,
        # alert, emerg.
        LogLevel warn

        CustomLog ${APACHE_LOG_DIR}/laravel-access.log combined
</VirtualHost>

only one localhost is possible ...

Each virtualhost, should have a servername directive.

If you are accessing your laravel (rpm) install under localhost, you just need to add the alias for it.

Alias /rpm /home/user/development/rpm/public

<Directory "/home/user/development/rpm/public">
    Options Indexes FollowSymLinks MultiViews
    AllowOverride all
    Order Allow,Deny
    Allow from all
</Directory>

As mentioned, you don't need a 2nd DocumentRoot/ServerName as you already have that host defined under VirtualHost *:80 being localhost. The Alias directive will allow to mask/symlink that folder as if it were under your localhost folder.