Restore rest-client `:require => false`
Restore rest-client `:require => false`

This was erroneously removed in fcf9d678178b347a9f3db0820a04ae25f857fa00

aljesusg/manageiq-gems-pending,aljesusg/manageiq-gems-pending,rsevilla87/manageiq-gems-pending,rsevilla87/manageiq-gems-pending