Description of problem:

There is a Syntax-failure in the SQL-statement _query_parent_channel_subscribed in rhnChannel.py:

select 1
  from rhnChannel c,
       join rhnServerChannel sc on c.parent_channel = sc.channel_id
  where sc.server_id = :sid
    and c.label = :channel

it should be 

select 1
  from rhnChannel c
       join rhnServerChannel sc on c.parent_channel = sc.channel_id
  where sc.server_id = :sid
    and c.label = :channel

The comma is too much. This rises an SQL-Exception.

Version-Release number of selected component (if applicable):

min. 2.2 

How reproducible:

Just one example, how we found the problem, i think, there are more ways to do it.

Steps to Reproduce:
1. try to add a channel via spacewalk-channel -a -c $NAME in a client
2. look in the rhn_server_xmlrpc.log on the server
3. you will see a message like 
"server/apacheRequest.call_function('ERROR', 'rhnSQL.SQLError caught', SQLStatementPrepareError('FEHLER: ... ... "

Actual results:

The client recieves an internal error from the server and nothing happens.

Expected results:

The channel should be added.

Additional info:

nope