testing/cloud-utils: Split ec2metadata and growpart into separate packages.

ec2metadata and growpart have lighter dependancies than the other cloud-utils tools and the also are used in VMs whereas the other tools are typically used to create/launch VMs so it makes sense to split them.

Become package maintainer. Original maintainer has not made any changes since package was first created more than 1 year ago, has not responded to an email I recently sent, maintains no other Alpine packages and so I'm assuming he is no longer actively involved with Alpine Linux.

My cloud-init packages make use of growpart and in order to move cloud-init from testing to community repo cloud-utils would also need to move so I have a self-interest in cloud-utils being actively maintained.