print filesystem_host valhalla node on curl connect
revert session.c
Merge pull request #149 from pantheon-systems/curl-debug

Curl debug: up logging level to show valhalla node curl is connecting to
last_failure by thread so only one thread goes into saint mode
Merge pull request #150 from pantheon-systems/saint-mode-by-thread

last_failure by thread so only one thread goes into saint mode
Merge pull request #151 from pantheon-systems/master

last_failure by thread so only one thread goes into saint mode