Replace merge_array function, linting for l23network

- Replace merge_array function with concat from stdlib
- Fix linting for l23network
- Disable the 80 character check in l23network Rakefile

Change-Id: Ie5ae6c7c247c070be80021c415a0a02d2819ec23
Closes-Bug: 1323597
Merge "Replace merge_array function, linting for l23network"