[BUGFIX] Only activate HTTP2 on Xenial

recipes/default.rb

@@ -69,6 +69,10 @@ if node['platform_version'] == '16.04'
 			action :install
 		end
 	end
+
+	apache_module 'http2' do
+		enable true
+	end
 else
 	include_recipe 'apache2::mod_php5'
 	%w(php5-curl php5-intl php5-gd php5-mcrypt php5-mysql php5-imagick).each do |name|
@@ -78,7 +82,7 @@ else
 	end
 end
 
-%w{expires headers ssl deflate rewrite http2}.each do |name|
+%w{expires headers ssl deflate rewrite}.each do |name|
 	apache_module name do
 		enable true
 	end