ssoadm import-svc-cfg fails after changing amadmin password

Steps to reproduce:

1. Change the three amadmin passwords:
   Under Access Control > / (Top Level Realm) > Subjects > User
   Configuration > Servers and Sites > (server name) > Directory Configuration
   opends/config/config.ldif
2. Run the export command (with new password file).

   # ./ssoadm export-svc-cfg -u amadmin -e fAMvO7zJ2o5cbYJP3w8mpBZLpNndFMaA -f password.txt -o ~/backup-`date -u +%F-%m-%S`.xml
   
   Service Configuration was exported.
   

3. Run the import command.

   # ./ssoadm import-svc-cfg -u amadmin -e fAMvO7zJ2o5cbYJP3w8mpBZLpNndFMaA -f password.txt -X ~/backup-2015-09-28-09-31.xml
   
   Login failed.
   

   If you use the old amadmin password file, ssoadm import-svc-cfg works fine.