Shim

• Fix an issue where a goroutine could be leaked if using the binary cmd option (Thanks @hex0punk!)
• Optimize osversion.Build() and Get() to only get invoked once and cache the result. (Thanks @thaJeztah!)
• Fixed a bug in the tar2ext4 code to correctly handle unordered tars not starting with a root folder. (Thanks @estebanreyl!)
• Add support for assigning a Utility VM to a cpu group at creation time of the VM on supported builds.
• Support passing in propagation flags for SCSI mounts for LCOW.
• Close individual stdio IO relay pipes when the relay is finished. This fixes some unwanted behavior if the shim's IO relay is severed on the write end.

Hns/Hcn

• Add the definition for VmEndpointRequest
• Add Ipv6 flag to HCN OutBoundNatPolicySetting
• Add proxy exceptions to L4WFP Proxy Policy
• Fix the supported version range for HNS Ipv6 Dual Stack support (HNS 11.10+).
• Add support for the TierAclPolicy.

Internal

• Move around HCS schema and resource path definitions to all be collocated under the hcs package.
• Add a new ttrpc service to facilitate talking to other virt stacks to launch hypervisor isolated containers.
• Revert grpc and genproto libraries to a prior version to avoid a panic in ttrpc.
• Add new vm package to abstract away direct HCS interactions to assist in talking to other virtstacks.
• Change from a hcsshim:: prefix to hcs:: in the internal/hcs packages logging to make log messages clearer in where the logs are originating from.
• Add a utility function to execute a command in a Utility VM for the cri-containerd test suite.