Call to virConnectOpen failed: authentication unavailable: no polkit agent available to authenticate action 'org.libvirt.unix.manage' error while adding LibVirt compute resource in Red Hat Satellite 6

Issue

• Testing connection of new Libvirt compute resource in Red Hat Satellite 6 returned following error:

  • Infrastructure > Compute Resource > New > Provide credentials > test connection:

  Unable to save
  Error making a connection to libvirt URI qemu+ssh://user@hypervisor.example.com/system: Call to virConnectOpen failed: authentication unavailable: no polkit agent 
  available to authenticate action 'org.libvirt.unix.manage'
  

• On listing systems via terminal:

  [root@satellite ~]# su foreman -s /bin/bash -c 'virsh -c qemu+ssh://user@hypervisor.example.com/system list'
  Error creating textual authentication agent: Error opening current controlling terminal for the process (`/dev/tty'): No such device or address (polkit-error-quark, 0)
  error: failed to connect to the hypervisor
  error: authentication unavailable: no polkit agent available to authenticate action 'org.libvirt.unix.manage'