Description of problem:
API call channel.software.clone does not takes in account the 'parent_label' parameter any longer and always the result channel is a Parent/Base channel instead of Child one.

Version-Release number of selected component (if applicable):
spacewalk-java-2.3.142-1

How reproducible:
Always.

Steps to Reproduce:
1. Create a Parent/Base (ch_parent) and Child channel(ch_child) via WebUI.
    Channels -> Manage Software Channels -> Create channel
2. Clone the Parent/Base channel.
    spacewalk-clone-by-date --assumeyes --channel=ch_parent clone-ch_parent  --username xxxxx --password xxxxx --to_date=2030-01-01
3. Clone the child channel via API using the following script:
  #!/usr/bin/env python
  RHN_SERVER='https://xxxx.redhat.com/rpc/api'
  RHN_USER='xxxxx'    
  RHN_PASS='xxxxx'
  client = xmlrpclib.Server(RHN_SERVER, verbose=0)
  key = client.auth.login(RHN_USER, RHN_PASS)

  details={'parent_label': 'clone-ch_parent', 'summary': 'clone-ch_child', 'name': 'clone-ch_child', 'label': 'clone-ch_child'}
  client.channel.software.clone(key, 'ch_child ', details, True)

Actual results:
clone-ch_child is a Parent/Base channel instead of Child one.

# spacewalk-remove-channel -l
ch_parent
	ch_child
clone-ch_parent
clone-ch_child


Expected results:
clone-ch_child is a Child channel with Parent clone-ch_parent.
# spacewalk-remove-channel -l
ch_parent
	ch_child
clone-ch_parent
	clone-ch_child


Additional info:
The Regression was caused by code refactoring and in particular by

SW commit: 2984025c0b3e0c4f044eafe9f363fe1b2bd3d585
    Port Errata Clone page from perl -> java
    Make nav link to java channel clone and errata clone pages
    Also make various clone errata jsps share common list