Description of problem:
2.3.3.1. PostgreSQL Database Requirements
If running a PostgreSQL External Database, install the postgresql-pltcl package to your system. This package contains the PL/Tcl procedural language for PostgreSQL, which Satellite's audit logging features require. To install this package, log in to your External Database server and run the following command:

# yun install postgresql-pltcl

should be "yum" instead of "yun"

Link: 
https://access.redhat.com/documentation/en-US/Red_Hat_Satellite/5.6/html/Installation_Guide/sect-Installation_Guide-External_Database_Requirements.html



Thanks!