Add code to be able to set default kinit lifetime

This is done by setting the kinit_lifetime option in default.conf
to a value that can be passed in with the -l option syntax of kinit.

https://pagure.io/freeipa/issue/7001

Signed-off-by: Simo Sorce <simo@redhat.com>
Reviewed-By: Pavel Vomacka <pvomacka@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>

ipaserver/rpcserver.py

@@ -969,7 +969,8 @@ class login_password(Backend, KerberosSession):
                 password,
                 ccache_name,
                 armor_ccache_name=armor_path,
-                enterprise=True)
+                enterprise=True,
+                lifetime=self.api.env.kinit_lifetime)
 
             if armor_path:
                 self.debug('Cleanup the armor ccache')