The high availability configuration of Qpid is provided by the package qpid-cpp-server-ha which is produced from SRPM qpid-cpp. Pulp includes and delivers all qpid-cpp SRPM bits for EL6 from koji so a recent version of Qpid is available on EL6. The qpid-cpp-server-ha package is missing a dependency called 'systemd-units' that is not available in base EL6 or EPEL.
Error: Package: qpid-cpp-server-ha-0.26-7.el6.x86_64 (pulp-v2)
EL6 doesn't use systemd so the only solution I can think of is to ask the Qpid team to rework the dependencies of qpid-cpp-server-ha to not require systemd-units.
Blocked by qpid upstream.
created an upstream bug with Qpid in JIRA to track the resolution upstream.
Upstream believes they have resolved the issue with qpid-cpp-0.26-9.el6.src.rpm. Justin built that in Koji , so I'm going to update our external_deps.json  so the next build will include it.
PR available at: https://github.com/pulp/pulp/pull/1249
QA to verify you should try to install the qpid-cpp-server-ha RPM. If it installs without an issue then verify the BZ.
Merged to 2.5-dev -> master
fixed in pulp 2.6.0-0.2.beta
>> rpm -qa pulp-server
>> yum install qpid-cpp-server-ha
Loaded plugins: amazon-id, pulp-profile-update, rhui-lb, security
Setting up Install Process
--> Running transaction check
---> Package qpid-cpp-server-ha.x86_64 0:0.26-9.el6 will be installed
--> Finished Dependency Resolution
Package Arch Version Repository Size
qpid-cpp-server-ha x86_64 0.26-9.el6 pulp-2.6-beta 266 k
Install 1 Package(s)
Total download size: 266 k
Installed size: 858 k
Is this ok [y/N]: y
qpid-cpp-server-ha-0.26-9.el6.x86_64.rpm | 266 kB 00:00
Running Transaction Test
Transaction Test Succeeded
Installing : qpid-cpp-server-ha-0.26-9.el6.x86_64 1/1
pulp: profile sent, status=201
Verifying : qpid-cpp-server-ha-0.26-9.el6.x86_64 1/1
>> rpm -qa qpid-cpp-server-ha
Moved to https://pulp.plan.io/issues/472