Don't stuck when salt minion/master is restarted

When applying salt.{master|minion} states salt may be restarted.
As result existed call stuck. This patch allows to set response
timeout for salt api POST calls, and if it is reached, retry it.
Enable retries for all salt.master|salt.api calls with read_timeout=60

Change-Id: Ibdf0f5ce0bc2e4640b7502b0abe71f81557e244d
3 files changed