add support for OpenBSD

[trefzer]

• add OpenBSD to supported in metadata.json
• make package_name optional, since OpenBSD installs libressl which part of the system, not available as package
• adapt spec tests for OpenBSD without package installation
• add spec test check for package name to be installed

[puppet-community-rangefinder[bot]]

openssl is a class

Breaking changes to this file WILL impact these 2 modules (exact match):

* [bkuebler-pureftpd](https://github.com/bkuebler/puppet-pureftpd.git) * [jhoblitt-nsstools](https://github.com/jhoblitt/puppet-nsstools.git)

Breaking changes to this file MAY impact these 1 modules (near match):

* [ULHPC-apache](https://github.com/ULHPC/puppet-apache)

openssl::packages is a class

that may have no external impact to Forge modules.

This module is declared in 2 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.