yum-rhn-plugin on RHEL7 does not respect the keepcache=0 entry at /etc/yum.conf

Issue

• A Red Hat Enterprise Linux 7 system registered to Satellite 5.x does not respect the option keepcache=0 set at /etc/yum.conf. For any yum operation, all the RPM packages are being kept under /var/cache/yum directory.

# cat /etc/yum.conf  | grep -v ^$ | grep -v ^#
[main]
cachedir=/var/cache/yum/$basearch/$releasever
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
installonly_limit=3

# yum install tree -y
Loaded plugins: product-id, rhnplugin, search-disabled-repos, subscription-manager, verify
This system is receiving updates from RHN Classic or Red Hat Satellite.
Resolving Dependencies
--> Running transaction check
---> Package tree.x86_64 0:1.6.0-10.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

==================================================================================================================
 Package             Arch                  Version                      Repository                           Size
==================================================================================================================
Installing:
 tree                x86_64                1.6.0-10.el7                 rhel-x86_64-server-7                 46 k

Transaction Summary
==================================================================================================================
Install  1 Package

Total download size: 46 k
Installed size: 87 k
Downloading packages:
tree-1.6.0-10.el7.x86_64.rpm                                                               |  46 kB  00:00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : tree-1.6.0-10.el7.x86_64                                                                       1/1 
  Verifying  : tree-1.6.0-10.el7.x86_64                                                                       1/1 

Installed:
  tree.x86_64 0:1.6.0-10.el7              

# tree /var/cache/yum/
/var/cache/yum/
└── x86_64
    └── 7Server
        ├── rhel-x86_64-server-7
        │   ├── cachecookie
        │   ├── comps.xml
        │   ├── gen
        │   │   ├── primary.xml
        │   │   └── primary.xml.sqlite
        │   ├── packages
        │   │   └── tree-1.6.0-10.el7.x86_64.rpm
        │   ├── primary.xml.gz
        │   ├── repomd.xml
        │   ├── rhnversion
        │   └── updateinfo.xml.gz
        └── rhnplugin.repos

5 directories, 10 files