Updating sahara-ci readme
Updating sahara-ci readme

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

Change-Id: I37667cfbf9b274c03d628dc3b83983d9fe600644

ekasitk/sahara,crobby/sahara,tellesnobrega/sahara,henaras/sahara,zhangjunli177/sahara,henaras/sahara,tellesnobrega/sahara,redhat-openstack/sahara,esikachev/sahara-backup,matips/iosr-2015,redhat-openstack/sahara,crobby/sahara,redhat-openstack/sahara,matips/iosr-2015,henaras/sahara,egafford/sahara,matips/iosr-2015,ekasitk/sahara,bigfootproject/sahara,openstack/sahara,zhangjunli177/sahara,zhangjunli177/sahara,esikachev/sahara-backup,bigfootproject/sahara,ekasitk/sahara,egafford/sahara,bigfootproject/sahara,openstack/sahara,crobby/sahara,esikachev/sahara-backup