cli: Accept K,M,G suffixes for size parameters

For every parameter dealing with a size as option, such as memory or
virtio-pmem, the CLI can now parse sizes with the suffixes K, M or G.

Fixes #70

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

vmm/src/vm.rs

@@ -924,7 +924,7 @@ impl<'a> Vm<'a> {
         let fd = Arc::new(fd);
 
         // Init guest memory
-        let arch_mem_regions = arch::arch_memory_regions(config.memory.size << 20);
+        let arch_mem_regions = arch::arch_memory_regions(config.memory.size);
 
         let guest_memory = match config.memory.file {
             Some(file) => {