Integration tests of installation manager failed because of lack of RHEL subscription

[dmytro-ndp]

Integration tests of working Installation manager inside the RHEL 7 OS failed because of system hadn't unregistered properly in time of the previous test execution:

==> master: Registering to: subscription.rhn.redhat.com:443/subscription
==> master: The system has been registered with ID: bcd49bff-4cee-4790-a31f-45fe144d7866
==> master:
==> master: Installed Product Current Status:
==> master: Product Name: Red Hat Enterprise Linux Server
==> master: Status: Not Subscribed
==> master:
==> master: Unable to find available subscriptions for all your installed products.
==> master: Error: rhel-7-server-optional-rpms is not a valid repository ID. Use --list option to see valid repositories.
==> master: Error: rhel-7-server-extras-rpms is not a valid repository ID. Use --list option to see valid repositories.

The problem is: error in lib.sh library of integration tests where system unregister commands don't execute for the additional node.

Solution: unregister system by using special vagrant trigger which will be called on destroy event:

  # run some script before the guest is destroyed;
  # execute next command to install 'vagrant-trigger' plugin to be able to trigger event: "vagrant plugin install vagrant-triggers"
  config.trigger.before :destroy do
    run_remote  "bash -c 'sudo subscription-manager unregister'"
  end

Is needed for issue #479 to unblock testing in RHEL OS.