MODULES-10915: use facter 3 for spec test

This likely needs fixing in pdk or .sync but wanted to at least test the
fix first

.travis.yml

@@ -37,6 +37,10 @@ matrix:
       env: PUPPET_GEM_VERSION="~> 6.0" CHECK=parallel_spec
       rvm: 2.5.3
       stage: spec
+    -
+      env: FACTER_GEM_VERSION='~> 3.11.0' PUPPET_GEM_VERSION="~> 6.0" CHECK=parallel_spec
+      rvm: 2.5.3
+      stage: spec
     -
       env: DEPLOY_TO_FORGE=yes
       stage: deploy

lib/facter/lvm_support.rb

@@ -1,7 +1,9 @@
 # lvm_support: true/nil
 #   Whether there is LVM support (based on the presence of the "vgs" command)
 Facter.add('lvm_support') do
-  confine kernel: :linux
+  confine do
+    Facter.value('kernel') == 'Linux'
+  end
 
   setcode do
     vgdisplay = Facter::Util::Resolution.which('vgs')

spec/unit/facter/lvm_support_spec.rb

@@ -7,7 +7,7 @@
   end
 
   context 'when not on Linux' do
-    it 'is set to not' do
+    it 'is set to nil' do
       Facter.fact(:kernel).expects(:value).at_least(1).returns('SunOs')
       Facter.value(:lvm_support).should be_nil
     end