Add delete_if_empty parameter to the ini_subsetting type/provider

[mmarod]

Adds the capability to remove a parent setting when a subsetting is empty.

Example:

[one]
key = alphabet
key2 = moo

When the following Puppet resource is specified, the key is removed instead of being left empty:

ini_subsetting { 'ensure => absent for alpha':
  ensure          => absent,
  path            => "/tmp/inifile.ini",
  section         => 'one',
  setting         => 'key',
  subsetting      => 'alpha',
  delete_if_empty => true,
}

This results in:

[one]
key2 = moo

Instead of

[one]
key = 
key2 = moo

[puppet-community-rangefinder]

ini_subsetting is a type

Breaking changes to this file MAY impact these 15 modules (near match):

• ajroetker-puppet_server
• danzilio-scribe_reporter
• udzura-report_slack2
• juame-ospuppet
• tedivm-hieratic
• karmafeast-report_slack
• slenky-notifier
• danzilio-extended_http_report_processor
• dylanratcliffe-sumologic
• cloudscaling-scaleio_openstack
• Lavaburn-cabot
• abstractit-puppet
• landcareresearch-ckan
• puppetlabs-puppetdb
• ncorrare-reportslack

This module is declared in 127 of 575 indexed public Puppetfiles.

---

These results were generated with Rangefinder, a tool that helps predict the downstream impact of breaking changes to elements used in Puppet modules. You can run this on the command line to get a full report.

Exact matches are those that we can positively identify via namespace and the declaring modules' metadata. Non-namespaced items, such as Puppet 3.x functions, will always be reported as near matches only.

[codecov-commenter]

Codecov Report

Merging #405 into master will increase coverage by 0.27%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #405      +/-   ##
==========================================
+ Coverage   89.56%   89.83%   +0.27%     
==========================================
  Files          10       10              
  Lines         594      600       +6     
==========================================
+ Hits          532      539       +7     
+ Misses         62       61       -1     

Impacted Files	Coverage Δ
lib/puppet/provider/ini_subsetting/ruby.rb	97.91% <100.00%> (+0.09%)	⬆️
lib/puppet/type/ini_subsetting.rb	98.61% <100.00%> (+1.55%)	⬆️

---

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[daianamezdrea]

Hi @mmarod, this looks good to me and also, all the tests went good. Thank you for your contribution!