Add a puppetdb_version fact with PuppetDB version

[rwaffen]

The code changes add a new Facter fact called puppetdb_version that retrieves the version of PuppetDB installed on the system. It uses the puppetdb --version command to fetch the version and returns it as a fact value.

[Geod24]

Release v8.1.0 is broken for some people because of this.
See issues #412 and #413 . @rwaffen I needed the following to work around the problem on Debian:

diff --git a/puppet/3rd-party-modules/puppetdb/lib/facter/puppetdb_version.rb b/puppet/3rd-party-modules/puppetdb/lib/facter/puppetdb_version.rb
index b04fb26ce..f75847652 100644
--- a/puppet/3rd-party-modules/puppetdb/lib/facter/puppetdb_version.rb
+++ b/puppet/3rd-party-modules/puppetdb/lib/facter/puppetdb_version.rb
@@ -2,7 +2,7 @@ Facter.add(:puppetdb_version) do
   confine { Facter::Util::Resolution.which('puppetdb') }

   setcode do
-    output = Facter::Core::Execution.execute('puppetdb --version')
-    output.split(':').last.strip
+    output = Facter::Core::Execution.execute('puppetdb version')
+    output.split('=').last.strip
   end
 end

[smortex]

puppetdb version

On Debian (AIO packages) and FreeBSD (packages built from Puppetlabs tarballs), I get:

% puppetdb version
puppetdb: 'version' is not a puppetdb command. See 'puppetdb --help'.
% puppetdb --version
puppetdb version: 8.5.1

What did you install?