[Yum] Support validiting ssl server cert for https accessible yum repositories?

[Ben Grommes]

As far as I can tell there is no support in yum for validating the server cert
used by an https accessible yum repository.  Can someone confirm that this is
indeed the case?  

Specifically, I was looking for the ability to specify a trusted ca cert to
check the issuer of the ssl server cert against as part of establishing the
https connection.