Allow overriding the detected $apache_name.

[smerrill]

This will mainly be useful for supporting Red Hat Software Collections, where 'httpd24-httpd' installs Apache 2.4 alongside Apache 2.2 in the base repository. The $service_name parameter already allows customization of the service to use, but not the package.

With this PR, the following can be used to set up and run Apache 2.4 on RHELish systems. (The config snippet I mentioned in #818 was missing this.)

  softwarecollectionsorg { 'httpd24': }
  class { '::apache':
    apache_name    => 'httpd24-httpd',
    service_name   => 'httpd24-httpd',
    apache_version => '2.4',
    mpm_module     => 'event',
    httpd_dir      => '/opt/rh/httpd24/root/etc/httpd',
    vhost_dir      => '/opt/rh/httpd24/root/etc/httpd/conf.d',
    require        => Softwarecollectionsorg['httpd24'],
  }

[puppetcla]

Waiting for CLA signature by @smerrill

@smerrill - We require a Contributor License Agreement (CLA) for people who contribute to Puppet, but we have an easy click-through license with instructions, which is available at https://cla.puppetlabs.com/

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[underscorgan]

@smerrill Can you please update the README and add a test case to exercise the new parameter?

Thanks!

[underscorgan]

@smerrill Could you squash this to a single commit? Otherwise, looks good!

[smerrill]

Squashed commits attached for this one and #818. I'm talking with my company about accepting the CLA. Hopefully I'll have an answer soon.

[smerrill]

I've accepted the CLA.

[puppetcla]

CLA signed by all contributors.