Description of problem:
When you run rhn_package_manager with -s, --username and --password options, it throws KeyError. It's because of wrong channel name.

Version-Release number of selected component (if applicable):
spacewalk-proxy-package-manager-2.0.1-11.el5sat

How reproducible:
always

Steps to Reproduce:
1. Create channel
2. Push package to channel using rhn_package_manager
# yumdownloader zsh
zsh-4.2.6-10.el5_11.x86_64.rpm

# rhn_package_manager -c proxy_pkg_manager_3581 zsh-4.2.6-10.el5_11.x86_64.rpm --username=user --password=pass

3. Everything is good when I run rhn_package_manager without --username and --password
When I change source and print out list p:
['zsh', '4.2.6', '10.el5_11', '', 'x86_64', 'proxy_pkg_manager_3581']

channelName = p[5]
p[5] = 'proxy_pkg_manager_3581'
it's correct channel name

4. When I run rhn_package_manager with --username --password, I get KeyError
# rhn_package_manager -s -c proxy_pkg_manager_3581  --username=user --password=pass

Traceback (most recent call last):
  File "/usr/bin/rhn_package_manager", line 27, in ?
    rhn_package_manager.main()
  File "/usr/share/rhn/PackageManager/rhn_package_manager.py", line 97, in main
    upload.checkSync()
  File "/usr/share/rhn/PackageManager/rhn_package_manager.py", line 199, in checkSync
    remotePackages[channelName][key] = None
KeyError: 'md5'

I print same list as in previous step:
['zsh', '4.2.6', '10.el5_11', '', 'x86_64', 'md5', 'dcb5e442e8b35c592e11ece2337fbe73', 'proxy_pkg_manager_3581']

channelName = p[5]
p[5] = 'md5'
Therefore channelName is incorrect and it throws KeyError

Actual results:
KeyError because of wrong channelName

Expected results:
It should work with --username --password without KeyError