[Gluster-infra] Please install netstat on the Jenkins slaves for regression testing

[Niels de Vos]

We have one test-case that uses netstat (tests/bugs/fuse/bug-924726.t).
When netstat is not installed, this testcase will not be run correctly.

Please merge/squash this change and apply it to the slaves:
  https://github.com/gluster/gluster.org_ansible_configuration/pull/1

Once done, we can re-run the regression tests for
http://review.gluster.org/13547 .

Thanks,
Niels
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