Description of problem:
Unlike the other variants of RHEL6, the ComputeNode variant does not
include its name in the channel name. As a result spacewalk-create-channel
fails to guess channel name based on the variant.

Version-Release number of selected component (if applicable):
spacewalk-remote-utils-1.0.2-7.el6sat.noarch

How reproducible:
always

Steps to Reproduce:
1. satellite-sync -c rhel-x86_64-hpc-node-6
2. spacewalk-create-channel \
   --server=FQDN --user=admin --password=subtle \
   --version=6 --update=u1 --arch=x86_64 --release=ComputeNode \
   --destChannel=sw_create_channel_29938
3.
  
Actual results:
You have not specified a source channel,
we will try to determine it from inputs
Trying with source channel: rhel-x86_64-computenode-6
Error: Source Channel 'rhel-x86_64-computenode-6' could not be found.

Expected results:
You have not specified a source channel, we will try to determine it from inputs
Trying with source channel: rhel-x86_64-hpc-node-6
....

Additional info:
For the Server variant there is a rhel-x86_64-server-6 channel,
for the Client variant there is a rhel-x86_64-client-6,
finally for Workstation variant there is a rhel-x86_64-workstation-6.
What a pity is that for ComputeNode variant there is not
rhel-x86_64-computenode-6 but rhel-x86_64-hpc-node-6.