Create missing /etc/httpd/alias for ipasession.key
    
    The director /etc/httpd/alias was created by mod_nss. Since FreeIPA no
    longer depends on mod_nss, the directory is no longer created on fresh
    systems.
    
    Note: At first I wanted to move the file to /var/lib/ipa/private/ or
    /var/lib/httpd/. SELinux prevents write of httpd_t to ipa_var_lib_t. I'm
    going to move the file after a new SELinux policy is available.
    
    See: https://pagure.io/freeipa/issue/7529
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>