+++ This bug was initially created as a clone of Bug #1052051 +++

Description of problem:

When a System Set is created with all the same type of hosts (i.e. RHEL6), but which individually have different package-sets, packages which should be installed on one host end up on all other hosts in the set. It does not seem to be unique anymore. 

Example:

zsh is installed on one host and an update is available; another host does not have zsh installed but after the run it is installed.

How reproducible:

Reproducible

Steps to Reproduce:
1. In System Set Manager, schedule the packages that will be updated to 2 
   RHEL6 systems (System1 and System2). For example, the following packages 
   are selected:

   ca-certificates-2013.1.95-65.1.el6_5
   systemtap-2.3-4.el6_5
   systemtap-client-2.3-4.el6_5
   systemtap-devel-2.3-4.el6_5
   systemtap-runtime-2.3-4.el6_5

2. In System Set Manager> Packages>Upgrade> 
   the following are listed to be applied:
 
   System1          ca-certificates-2013.1.95-65.1.el6_5  
                    systemtap-runtime-2.3-4.el6_5
   System2          ca-certificates-2013.1.95-65.1.el6_5
                    systemtap-2.3-4.el6_5
                    systemtap-client-2.3-4.el6_5
                    systemtap-devel-2.3-4.el6_5
                    systemtap-runtime-2.3-4.el6_5

3. After the run, System1 has all of the 5 packages installed.


Actual results:

System1 is installed with the following packages:

ca-certificates-2013.1.95-65.1.el6_5
systemtap-2.3-4.el6_5
systemtap-client-2.3-4.el6_5
systemtap-devel-2.3-4.el6_5
systemtap-runtime-2.3-4.el6_5


Expected results:

System1 should only have 2 packages updated:

ca-certificates-2013.1.95-65.1.el6_5  
systemtap-runtime-2.3-4.el6_5

System1 is not installed with the following packages, so they should not be updated:

systemtap-2.3-4.el6_5
systemtap-client-2.3-4.el6_5
systemtap-devel-2.3-4.el6_5

--- Additional comment from Stephen Herr on 2014-02-14 13:31:51 EST ---

Note:

This behavior only occurs if both systems actually need packages to be updated. If one system has no updates entirely, then no packages will be installed on it. A more full reproducer then is:

1) have two systems, one which has an outdated tcsh and does not have zsh installed, and one which has an outdated tcsh and zsh
2) use system set manager to schedule an update to those two packages
3) not that the webui says it will do the correct thing
4) run rhn_check on each, notice that zsh got install on the first server when it should not have been