Move /nodes/stats/ to /nodes/stats/jobs/

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Rename node job stats template

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Add node lock stats!

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>