(SIMP-6536) Replace simpcat with concat in fixtures (#22)

- Fixed tests that were failing because of a deps change
- Consolidated .fixtures*yml files

SIMP-6536 #comment Fix pupmod-simp-resolv tests

.fixtures.yml

@@ -3,8 +3,11 @@ fixtures:
   repositories:
     named: "https://github.com/simp/pupmod-simp-named.git"
     rsync: "https://github.com/simp/pupmod-simp-rsync.git"
+    selinux_core:
+      repo: "https://github.com/simp/pupmod-puppetlabs-selinux_core"
+      puppet_version: ">= 6.0.0"
     stdlib: "https://github.com/simp/puppetlabs-stdlib.git"
     simplib: "https://github.com/simp/pupmod-simp-simplib.git"
-    simpcat: "https://github.com/simp/pupmod-simp-simpcat.git"
+    concat: "https://github.com/simp/puppetlabs-concat.git"
   symlinks:
     resolv: "#{source_dir}"

Rakefile

@@ -1,10 +1,4 @@
 require 'simp/rake/pupmod/helpers'
 require 'puppet-strings/tasks'
 
-unless ENV['FIXTURES_YML']
-  if Gem::Version.new(Puppet.version) >= Gem::Version.new('6')
-    ENV['FIXTURES_YML'] = File.join(File.dirname(__FILE__), '.fixtures6.yml')
-  end
-end
-
 Simp::Rake::Pupmod::Helpers.new(File.dirname(__FILE__))