Description of problem:
API call "channel.software.mergeErrata" behave not as expected.

Version-Release number of selected component (if applicable):
Satellite 5.4.1
Satellite 5.5.0

How reproducible:
100%

Steps to Reproduce:
1. satellite-sync -c rhel-x86_64-server-5
2. Create custom channel : test_merge_errata
3. Execute the following script

import sys, xmlrpclib
RHN_SERVER='https://sat-server@rehat.com/rpc/api'
RHN_USER='admin'
RHN_PASS='xxxxx'

client = xmlrpclib.Server(RHN_SERVER, verbose=0)
key = client.auth.login(RHN_USER, RHN_PASS)

CHANN='test_merge_errata'
client.channel.software.mergeErrata(key,'rhel-x86_64-server-5',CHANN)
  
Actual results:
The api call retuns list of erratas were supposed to be merget to the custom channel but actually there are no erratas in "test_merge_errata"

Expected results:
All erratas from rhel-x86_64-server-5 are merged to "test_merge_errata".


Additional info:
Probably a regression.According to JUnit test
http://svn.rhndev.redhat.com/viewcvs/trunk/qa/rpcapi/600/java/src/com/redhat/rhn/rpc/api/channel/software/mergeErrata.java?rev=205855&view=markup

as some moment it was working.