Change in ovirt-engine-sdk-ruby[sdk_4.0]: Add example showing how to list system roles

[Code Review]

>From Juan Hernandez <juan.hernandez at redhat.com>:

Juan Hernandez has submitted this change and it was merged.

Change subject: Add example showing how to list system roles
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Add example showing how to list system roles

This patch adds an example that shows how list all the roles available
in the system.

Change-Id: I6790b386f4af5f7b1aa303ab88da78ca49d95d08
Signed-off-by: Juan Hernandez <juan.hernandez at redhat.com>
(cherry picked from commit b22c470bdf6a61106b0273ba33c0c134ccc046e0)
---
A sdk/examples/list_roles.rb
1 file changed, 47 insertions(+), 0 deletions(-)

Approvals:
  Juan Hernandez: Verified; Looks good to me, approved; Passed CI tests



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Gerrit-MessageType: merged
Gerrit-Change-Id: I6790b386f4af5f7b1aa303ab88da78ca49d95d08
Gerrit-PatchSet: 1
Gerrit-Project: ovirt-engine-sdk-ruby
Gerrit-Branch: sdk_4.0
Gerrit-Owner: Juan Hernandez <juan.hernandez at redhat.com>
Gerrit-Reviewer: Juan Hernandez <juan.hernandez at redhat.com>
Gerrit-Reviewer: gerrit-hooks <automation at ovirt.org>