remove remotevm implementation

This implementation was added for hcsshim + HvLite (OpenHCL). The idea was that we could use different virt stacks, as long as they implement the remotevm APIs. That initiative is dormant as of present and this codepath is no-op/dead code.

We can likely re-use and re-purpose the interfaces created in the package. But keeping the obsolete code demand maintenance cost too when we make changes to the interface. If we need to support this functionality in the future, this commit can be reverted.

Signed-off-by: Harsh Rawat <harshrawat@microsoft.com>

Author: rawahars