Description of problem:
after "yum update rpm"; yum no longer works:

$ yum list foo
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   /usr/lib/librpm.so.0: undefined symbol: cap_compare

Please install a package which provides this module, or
verify that the module is installed correctly.

... etc.

Indeed:

# ldd -r /usr/lib/librpm.so.0
undefined symbol: cap_compare   (/usr/lib/librpm.so.0)


Steps to Reproduce:
1. have libcap-2.10
2. yum update rpm
3. yum update anything  # won't work