* retry initial transfer
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* fix import grouping
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* add test; use backoff timeout
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* fix import order
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

* manual backoff
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>