builder.aws: use key pair from comm struct

builder/amazon/common/run_config.go

@@ -57,9 +57,8 @@ type RunConfig struct {
 	WindowsPasswordTimeout            time.Duration     `mapstructure:"windows_password_timeout"`
 
 	// Communicator settings
-	Comm           communicator.Config `mapstructure:",squash"`
-	SSHKeyPairName string              `mapstructure:"ssh_keypair_name"`
-	SSHInterface   string              `mapstructure:"ssh_interface"`
+	Comm         communicator.Config `mapstructure:",squash"`
+	SSHInterface string              `mapstructure:"ssh_interface"`
 }
 
 func (c *RunConfig) Prepare(ctx *interpolate.Context) []error {
@@ -67,7 +66,7 @@ func (c *RunConfig) Prepare(ctx *interpolate.Context) []error {
 	// ssh_private_key_file, then create a temporary one, but only if the
 	// temporary_key_pair_name has not been provided and we are not using
 	// ssh_password.
-	if c.SSHKeyPairName == "" && c.TemporaryKeyPairName == "" &&
+	if c.Comm.SSHKeyPair == "" && c.TemporaryKeyPairName == "" &&
 		c.Comm.SSHPrivateKeyFile == "" && c.Comm.SSHPassword == "" {
 
 		c.TemporaryKeyPairName = fmt.Sprintf("packer_%s", uuid.TimeOrderedUUID())
@@ -93,7 +92,7 @@ func (c *RunConfig) Prepare(ctx *interpolate.Context) []error {
 		errs = append(errs, fmt.Errorf("Unknown interface type: %s", c.SSHInterface))
 	}
 
-	if c.SSHKeyPairName != "" {
+	if c.Comm.SSHKeyPair != "" {
 		if c.Comm.Type == "winrm" && c.Comm.WinRMPassword == "" && c.Comm.SSHPrivateKeyFile == "" {
 			errs = append(errs, fmt.Errorf("ssh_private_key_file must be provided to retrieve the winrm password when using ssh_keypair_name."))
 		} else if c.Comm.SSHPrivateKeyFile == "" && !c.Comm.SSHAgentAuth {