Bug 1158685: oo-accept-broker reports SELinux errors after installation

### `install_broker_pkgs`: Install policycoreutils-python

Install policycoreutils-python so that the `semanage` command will be available for use in `configure_selinux_policy_on_broker`.

This commit fixes bug 1158685.


### `install_broker_pkgs`: Make `pkgs` local
    
Declare the `pkgs` variable in `install_broker_pkgs` as local.