Fixes #4883: Add deduplication logic on IPs for same interface
Merge pull request #40 from fanf/bug_4883/deduplicate_ips_for_same_interface

Fixes #4883: Add deduplication logic on IPs for same interface
Merge branch 'branches/rudder/2.6' into branches/rudder/2.9
Merge branch 'branches/rudder/2.9' into branches/rudder/2.10