Symptom:
Steps to reproduce this problem:
1- Configure a manual multipoint VFI with a Pseudowire that is forward referencing
a non-existent pseudowire class.
Example:
<CmdBold>
l2 vfi vpls_test manual 
 vpn id 100
 bridge-domain 100
 neighbor 20.20.20.20 pw-class test
<noCmdBold>
2- Add the missing Pseudowire class. The problem is that the Pseudowire remains
down.
Example:
<CmdBold>
pseudowire-class test
 encapsulation mpls
!
<noCmdBold>

Conditions:
The issue is consitently reproducible for manual multipoint VFIs as long as
the VFI PW is configured first with a non-existent PW-Class then the PW-Class
is added later.