netvm spec: do not create user in %post

We don't need user account in netvm, do we?

rpm_spec/core-netvm.spec

@@ -84,7 +84,6 @@ fi
 
 sed 's/^net.ipv4.ip_forward.*/net.ipv4.ip_forward = 1/'  -i /etc/sysctl.conf
 usermod -L root
-usermod -L user
 if ! [ -f /var/lib/qubes/serial.orig ] ; then
 	cp /etc/init/serial.conf /var/lib/qubes/serial.orig
 fi