add gp3 support

lib/chef/knife/ec2_server_create.rb

@@ -161,8 +161,9 @@ class Ec2ServerCreate < Chef::Knife::Bootstrap
 
       option :ebs_volume_type,
         long: "--ebs-volume-type TYPE",
-        description: "Possible values are standard (magnetic) | io1 | gp2 | sc1 | st1. Default is gp2",
-        default: "gp2"
+        description: "Possible values are standard (magnetic) | io1 | gp2 | gp3 | sc1 | st1. Default is gp3",
+        proc: Proc.new { |key| Chef::Config[:knife][:ebs_volume_type] = key },
+        default: "gp3"
 
       option :ebs_provisioned_iops,
         long: "--provisioned-iops IOPS",
@@ -626,8 +627,8 @@ def plugin_validate_options!
           exit 1
         end
 
-        if config[:ebs_volume_type] && ! %w{gp2 io1 standard st1 sc1}.include?(config[:ebs_volume_type])
-          ui.error("--ebs-volume-type must be 'standard' or 'io1' or 'gp2' or 'st1' or 'sc1'")
+        if config[:ebs_volume_type] && ! %w{gp2 gp3 io1 standard st1 sc1}.include?(config[:ebs_volume_type])
+          ui.error("--ebs-volume-type must be 'standard' or 'io1' or 'gp2' or 'gp3' or 'st1' or 'sc1'")
           msg opt_parser
           exit 1
         end
@@ -682,8 +683,9 @@ def plugin_validate_options!
           # validation for ebs_size and ebs_volume_type and ebs_encrypted
           if !config[:ebs_size]
             errors << "--ebs-encrypted option requires valid --ebs-size to be specified."
-          elsif (config[:ebs_volume_type] == "gp2") && ! config[:ebs_size].to_i.between?(1, 16384)
-            errors << "--ebs-size should be in between 1-16384 for 'gp2' ebs volume type."
+
+          elsif (config[:ebs_volume_type] =~ /^gp/) && ! config[:ebs_size].to_i.between?(1, 16384)
+            errors << "--ebs-size should be in between 1-16384 for 'gp*' ebs volume type."
           elsif (config[:ebs_volume_type] == "io1") && ! config[:ebs_size].to_i.between?(4, 16384)
             errors << "--ebs-size should be in between 4-16384 for 'io1' ebs volume type."
           elsif (config[:ebs_volume_type] == "standard") && ! config[:ebs_size].to_i.between?(1, 1024)