Description of problem:
If a user attempts to push a custom patch or patch cluster and the text accompanying this patch or cluster contains a Unicode character (such as u'\xb7'), rhnpush will generate an ISE, containing the following Python traceback:

Exception Handler Information
Traceback (most recent call last):
  File "/usr/share/rhn/server/apacheUploadServer.py", line 107, in _wrapper
    ret = function(req)
  File "/usr/share/rhn/upload_server/handlers/package_push/package_push.py", line 145, in handler
    relative_path=self.rel_package_path, org_id=self.org_id)
  File "/usr/share/rhn/server/rhnPackageUpload.py", line 223, in push_package
    header_end=header_end, channels=channels)
  File "/usr/share/rhn/server/importlib/mpmSource.py", line 215, in create_package
    org_id=org_id, channels=channels)
  File "/usr/share/rhn/server/importlib/mpmSource.py", line 88, in populate
    org_id, channels)
  File "/usr/share/rhn/server/importlib/headerSource.py", line 135, in populate
    header_start, header_end)
  File "/usr/share/rhn/server/importlib/headerSource.py", line 57, in populate
    val = str(val)
UnicodeEncodeError: 'ascii' codec can't encode character u'\xb7' in position 4: ordinal not in range(128)

Since, to the best of my knowledge, Unicode is included on modern-day Solaris machines, it seems that we're assuming we'll be receiving ASCII text from the server side, and when we don't receive it, the Unicode codec bombs.

Version-Release number of selected component (if applicable):
530-re20090409.1

How reproducible:
Always

Steps to Reproduce:
1. Create a patch or patch cluster whose accompanying text includes a Unicode character that the ascii codec cannot encode to Unicode
2. Upload this patch or patch cluster to a Solaris box registered to a Satellite
3. rhnpush that patch or patch cluster
  
Actual results:
ISE and traceback e-mail similar to attached traceback e-mail

Expected results:
Upload successful

Additional info: