Update jenkins doc
Update jenkins doc

We don't gate py26 anymore. Also savanna-ci now have name
Sahara Hadoop Cluster CI

Change-Id: Ie98efa1e2ac135b00aa8927bcc347ac9f34c564d

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