Enable grub for hvm AMIs

bootstrapvz/providers/ec2/__init__.py

@@ -51,8 +51,6 @@ def validate_manifest(data, validator, error):
 	if virtualization == 'hvm':
 		if backing != 'ebs':
 			error('HVM AMIs currently only work when they are EBS backed', ['volume', 'backing'])
-		if bootloader != 'extlinux':
-			error('HVM AMIs currently only work with extlinux as a bootloader', ['system', 'bootloader'])
 		if bootloader == 'extlinux' and partition_type not in ['none', 'msdos']:
 			error('HVM AMIs booted with extlinux currently work with unpartitioned or msdos partitioned volumes',
 			      ['volume', 'partitions', 'type'])

bootstrapvz/providers/ec2/manifest-schema.yml

@@ -31,6 +31,7 @@ properties:
         type: string
         enum:
         - pvgrub
+        - grub
         - extlinux
   volume:
     type: object