Upgrade to privacyidea-radius 3.1~dev1 fails on Xenial

[fredreichbier]

On Ubuntu 16.04, the upgrade to privacyidea-radius 3.1~dev1 fails because freeradius cannot be restarted. freeradius -X prints the following:

 Module: Instantiating module "perl" from file /etc/freeradius/modules/mods-perl-privacyidea
  perl {
    module = "module"
    func_authorize = "authorize"
    func_authenticate = "authenticate"
    func_accounting = "accounting"
    func_preacct = "preacct"
    func_checksimul = "checksimul"
    func_detach = "detach"
    func_xlat = "xlat"
    func_pre_proxy = "pre_proxy"
    func_post_proxy = "post_proxy"
    func_post_auth = "post_auth"
    func_recv_coa = "recv_coa"
    func_send_coa = "send_coa"
  }
Can't open perl script "module": No such file or directory
rlm_perl: perl_parse failed: module not found or has syntax errors.  
/etc/freeradius/modules/mods-perl-privacyidea[1]: Instantiation failed for module "perl"
/etc/freeradius/sites-enabled/privacyidea[20]: Failed to find "perl" in the "modules" section.
/etc/freeradius/sites-enabled/privacyidea[20]: Failed to parse "perl" entry.

I think this is because of a typo in mods-perl-privacyidea: https://github.com/privacyidea/FreeRADIUS/blob/cfdcf4951dc1fded07103ee653d1948e53433225/config/freeradius3/mods-perl-privacyidea#L2 filename should be module. With this change, FreeRADIUS starts again.