Update redhat change host name capability to support systemd

Update capability to use guest inspection module for determining
correct actions to execute. When systemd is in use restart the
correct active service, either NetworkManager or networkd. Default
to using the original service restart when systemd service is not
found.

plugins/guests/redhat/cap/change_host_name.rb

@@ -2,6 +2,9 @@ module VagrantPlugins
   module GuestRedHat
     module Cap
       class ChangeHostName
+
+        extend Vagrant::Util::GuestInspection
+
         def self.change_host_name(machine, name)
           comm = machine.communicate
 
@@ -10,34 +13,32 @@ module VagrantPlugins
             comm.sudo <<-EOH.gsub(/^ {14}/, '')
               # Update sysconfig
               sed -i 's/\\(HOSTNAME=\\).*/\\1#{name}/' /etc/sysconfig/network
-
               # Update DNS
               sed -i 's/\\(DHCP_HOSTNAME=\\).*/\\1\"#{basename}\"/' /etc/sysconfig/network-scripts/ifcfg-*
-
               # Set the hostname - use hostnamectl if available
               echo '#{name}' > /etc/hostname
-              if command -v hostnamectl; then
-                hostnamectl set-hostname --static '#{name}'
-                hostnamectl set-hostname --transient '#{name}'
-              else
-                hostname -F /etc/hostname
-              fi
-
-              # Prepend ourselves to /etc/hosts
               grep -w '#{name}' /etc/hosts || {
                 sed -i'' '1i 127.0.0.1\\t#{name}\\t#{basename}' /etc/hosts
               }
-
-              # Restart network
-              if (test -f /usr/bin/systemctl && systemctl -q is-active NetworkManager.service); then
-                systemctl restart NetworkManager.service
-              elif test -f /etc/init.d/network; then
-                service network restart
-              else
-                printf "Could not restart the network to set the new hostname!\n"
-                exit 1
-              fi
             EOH
+
+            if hostnamectl?(comm)
+              comm.sudo("hostnamectl set-hostname --static '#{name}' ; " \
+                "hostnamectl set-hostname --transient '#{name}'")
+            else
+              comm.sudo("hostname -F /etc/hostname")
+            end
+
+            restart_command = "service network restart"
+
+            if systemd?
+              if systemd_networkd?(comm)
+                restart_command = "systemctl restart systemd-networkd.service"
+              elsif systemd_controlled?(comm, "NetworkManager.service")
+                restart_command = "systemctl restart NetworkManager.service"
+              end
+            end
+            comm.sudo(restart_command)
           end
         end
       end