check system  uptime after reboot

Change-Id: Iece8758c8ebad6c705413f32c87ee96b3de9f60f
Increases the wait time for images to download

Change-Id: Ica7eb221e9df440aa9e97bf6289e24f4315be20d
get_nodes: remove duplicate initialization of priv_hostname

Ansible from version 1.6.7 fails if there is a duplicate
initialization of a variable.
Refer: https://github.com/ansible/ansible/issues/8233

Change-Id: Ia25c59c6230a3169286798c875979a836ea0a327
Merge remote-tracking branch 'gerrit/master' into dev/reorg

Conflicts:
	roles/get_nodes/add_hosts/tasks/main.yml

Change-Id: I89785939198ee3763f60ceafadb4f3c247d32971