On some deployments the tests run on Neutron for multinode deployments
exceed the current 15 minutes timeout. The timeout is now configurable
through the OSH_TEST_TIMEOUT variable which can be passed from the yaml
file. The default timeout remains 15 minutes.
Change-Id: Ic5a1e9fd812e51ed51aef4de162b1c08d1c9a593
Signed-off-by: Abel Navarro <abel.navarro@gmail.com>