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fb64b2017d
Add support for VM Template factory on the clh path.
In order to support snapshot/restore-based VM templating,
the following changes were needed:
1. For clh.go, implement SaveVM, PauseVM, restoreVM, ResumeVM
2. Remove initrd config check for VM Templating path. The
root disk image (when using image mode) is created in memory
and therefore captured in the VM snapshot.
3. Truncate the memory file to the size of the VM at factory VM
create time. This allows CLH to use the memory file
as the backing for the template VM memory, allowing O(1)
snapshot times.
4. CLH uses memory zones as backing for its memory on the template paths
5. Update StartVM in CLH to use the restore path when template is
configured and available
Signed-off-by: Cameron Baird <cameronbaird@microsoft.com>