* nxos_interfaces: RMB state fixes
* shippable fixes
* Add add'l comments per review
* fix long line
* Fix mode/enabled system defaults handling
* fix N3L test skips
* lint
* test updates for titanium images
* doc fix
(cherry picked from commit d72025be75)
Add changelog for nxos_interfaces fix
Co-authored-by: Chris Van Heuveln <cvanheuv@cisco.com>