KRA: don't add KRA container when KRA replica
    
    This fixes regression caused by c56256e2a29f076e6afa559225a66f58b0773eb5
    """
      [9/11]: add vault container
    ipa         : CRITICAL Failed to load vault.ldif: Command
    '/usr/bin/ldapmodify -v -f /tmp/tmpxxO9IC -H
    ldapi://%2fvar%2frun%2fslapd-IPA-TEST.socket -x -D cn=Directory
    Manager
    -y /tmp/tmpVKinCZ' returned non-zero exit status 68
      [10/11]: apply LDAP updates
    """
    
    and removes unneded steps during installation of KRA replica,
    because KRA container must be there since installation of first KRA
    instance.
    
    Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>