comment to the dummy kvm_release_memory_shared_memory_snapshot()

Signed-off-by: Guanglin Xu <mzguanglin@gmail.com>
the concise VMI_INIT_SNAPSHOT flag

Signed-off-by: Guanglin Xu <mzguanglin@gmail.com>
fix to hold the longest /dev/shm/[domain name]xxxxxx path.

Signed-off-by: Guanglin Xu <mzguanglin@gmail.com>