release-20.4:Backport!5862 bump liftbridge 1.7.0

Merged EKbfh requested to merge cherry-pick-5ca57817 into release-20.4

Bump liftbridge to 1.7.0

See merge request !5862 (merged)

(cherry picked from commit 5ca57817)

4039737c Update ansible/system_roles/liftbridge/defaults/main.yml

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