Adds paging support to Enterasys B3/C3

[piterpunk]

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Tests added or adapted (try rake test)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

Adds paging handler to enterasys.rb model

The paging prompt that I have is:

--More-- <space> next page, <cr> one line, <q> quit

But saw in some documentations --More-- or (q)uit or even --More-- so I used a regexp that can handle all of them. Better safe than sorry.

Closes #2454