Updating sahara-ci readme
Updating sahara-ci readme

This change add minor grammar fixes to the scenario sahara-ci readme
file.

Change-Id: I37667cfbf9b274c03d628dc3b83983d9fe600644

esikachev/sahara-tests,esikachev/sahara-tests,openstack/sahara-tests,esikachev/sahara-tests,openstack/sahara-tests,openstack/sahara-tests,openstack/sahara-scenario,openstack/sahara-tests,openstack/sahara-scenario,openstack/sahara-scenario