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Description of problem:
yum upgrade from rhel-3 rh-postgresql to rhel-4 postgresql fails because
wrong package obsoletes rh-postgresql-SUB_PACKAGE:s.

postgresql package obsoletes all rh-postgresql-* sub-packages while
postgresql-server should obsolete rh-postgresql-server.

Currently postgresql package has obsoletes for all sub-packages so update will remove all sub-packages leaving system without postgresql-server.

Version-Release number of selected component (if applicable):
postgresql-7.4.7--2.RHEL4.1

How reproducible:
Always

Steps to Reproduce:
1. have rhel-3
2. yum update to rhel-4
3. there is no postgresql-server package (or other postgresql-*) sub-packages.
  

Actual Results:  postgresql and postgresql-libs packages are installed on system. but all other sub-packages are missing.

Expected Results:  If rpm tag:

Obsoletes: rh-postgresql-server

was in correct sub-package, upgrade would have worked.

And same goes for other sub-packages.
postgresql-tcl should obsolete rh-postgresql-tcl etc.


Additional info: