Fix transfer service dependencies:

- Fill OSVersion field of ocispec.Platform for windows OS in
transfer service plugin init()
- Do not return error from transfer service ReceiveStream if
stream.Recv() returned context.Canceled error

Signed-off-by: Kirtana Ashok <kiashok@microsoft.com>

platforms/platforms.go

@@ -213,6 +213,10 @@ func Parse(specifier string) (specs.Platform, error) {
 				p.Variant = cpuVariant()
 			}
 
+			if p.OS == "windows" {
+				p.OSVersion = GetWindowsOsVersion()
+			}
+
 			return p, nil
 		}
 
@@ -235,6 +239,10 @@ func Parse(specifier string) (specs.Platform, error) {
 			p.Variant = ""
 		}
 
+		if p.OS == "windows" {
+			p.OSVersion = GetWindowsOsVersion()
+		}
+
 		return p, nil
 	case 3:
 		// we have a fully specified variant, this is rare
@@ -244,6 +252,10 @@ func Parse(specifier string) (specs.Platform, error) {
 			p.Variant = "v8"
 		}
 
+		if p.OS == "windows" {
+			p.OSVersion = GetWindowsOsVersion()
+		}
+
 		return p, nil
 	}