Protect vs rally infine loop

Protect vs rally infine loop

It calls timeout (1 hour) to stop any hanging task [1].
It will be backported to Hunter and Iruya if similar failures are
detected.

It occurs vs Iruya too [2].

[1] https://build.opnfv.org/ci/job/functest-opnfv-functest-benchmarking-latest-rally_full-run/9/console
[2] https://build.opnfv.org/ci/job/functest-opnfv-functest-benchmarking-iruya-rally_jobs-run/151/console

Change-Id: I8fe89f9fa1c6c39cd8810096c1d586bdef7865a0
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
(cherry picked from commit fc5acf5d25f61487947df08477b9f239f40e486d)