spec_helper_acceptance: add abbility to enable Ipv6 in beaker hosts

Enabled by default
Also see: voxpupuli/modulesync_config#694

lib/voxpupuli/acceptance/spec_helper_acceptance.rb

@@ -25,7 +25,7 @@ def write_beaker_facts_on(hosts)
   end
 end
 
-def configure_beaker(modules: :metadata, configure_facts_from_env: true, &block)
+def configure_beaker(modules: :metadata, configure_facts_from_env: true, enable_ipv6: true, &block)
   ENV['PUPPET_INSTALL_TYPE'] ||= 'agent'
   ENV['BEAKER_PUPPET_COLLECTION'] ||= 'puppet6'
   ENV['BEAKER_debug'] ||= 'true'
@@ -61,6 +61,7 @@ def configure_beaker(modules: :metadata, configure_facts_from_env: true, &block)
       end
 
       write_beaker_facts_on(hosts) if configure_facts_from_env
+      on(hosts, 'sysctl net.ipv6.conf.all.disable_ipv6=0') if enable_ipv6
 
       if block
         hosts.each do |host|