Improve failOpen for duo_confluence

Summary:
Set timeout value in seconds instead of milliseconds.
Set the Duo session flag on fail open to prevent very slow requests during fail open.
Fix fail open logic.
Update plugin version.
Modify install script to use find instead of test since multiple files could potentially be found.

Test Plan:
Tested on local Trustedpath and Confluence instances.
Locked database tables to simulate a DOS attack. Made sure we correctly fail open after timeout is reached.
Made sure we fail close when the setting is turned off or not set.

Reviewers: karl, ben, peter, boyangz

Reviewed By: boyangz

Subscribers: dev

Maniphest Tasks: T9080

Differential Revision: https://phab.duosec.org/D5521
Merge branch 'master' of github.com:duosecurity/duo_confluence
Update jar file