Vendor c/common changes

Vendor latest c/common with changes to add a new Farms
table to containers.conf and update system connection to
add a connection to a farm when --farm is set.

Signed-off-by: Urvashi Mohnani <umohnani@redhat.com>

vendor/github.com/Microsoft/hcsshim/internal/winapi/utils.go

@@ -80,3 +80,9 @@ func ConvertStringSetToSlice(buf []byte) ([]string, error) {
 	}
 	return nil, errors.New("string set malformed: missing null terminator at end of buffer")
 }
+
+// ParseUtf16LE parses a UTF-16LE byte array into a string (without passing
+// through a uint16 or rune array).
+func ParseUtf16LE(b []byte) string {
+	return windows.UTF16PtrToString((*uint16)(unsafe.Pointer(&b[0])))
+}