Latest version of rest-client.

ssl_version option was added to manageiq vendor/gems/rest-client in 2012
The vendored gem was moved into manageiq/rest-client repo.

#ManageIQ/rest-client@0354d26

The patch we applied: L2G/rest-client-fork#3 was basically 123
rest-client/rest-client#123 was added to rest-client 1.6.7 but later removed
final: rest-client/rest-client#140 (which has since been tweaked)