Add call to puavo-ltsp-login so that also ltsp servers get locale information
and move execution of puavo-ltsp-envfeed right after so that also NX sessions
get the env variables as they do not seem to execute the PAM session modules
for the user.
motd and mailbox status are not needed for ltsp ssh logins as they are
fully automatic and nobody ever sees them.
Allow logins using ssh keys - needed for future FreeNX support.