Change ETCD server to newer version (v2.2.2)
Change ETCD server to newer version (v2.2.2)

Install newer version of etcd, extract the version
parameter out from the installation script.

Change-Id: I4559d853d9d622891cbf4b000e8aeca17b5f9374

openstack/dragonflow,FrankDuan/df_code,openstack/dragonflow,openstack/dragonflow,FrankDuan/df_code,FrankDuan/df_code