feat: allow define node['fail2ban']['ignoreip'] as array

[igolman]

Description

This allows to define node['fail2ban']['ignoreip'] also as an array. This way users of default recipe may make use of deep merge of attributes and not be required to re-define this attribute in nested chef roles.

'deep merge' example:

base chef role:

name 'fail2ban_base'
run_list %w(
  recipe[fail2ban::default]
)

default_attributes(
  fail2ban: {
     ignoreip: %w(1.2.3.4)
     ...
  }
)

Then in another chef role:

name 'fail2ban_extend'

run_list %w(
  role[fail2ban_base]
)

default_attributes(
  fail2ban: {
     ignoreip: %w(5.6.7.8)
     ...
  }

results to: node['fail2ban']['ignoreip'] = [ '1.2.3.4', '5.6.7.8' ]

Issues Resolved

None.

Check List

• A summary of changes made is included in the CHANGELOG under ## Unreleased
• [-] New functionality includes testing.
• [-] New functionality has been documented in the README if applicable.