bugfix: can't create pod due to miss of shim-init.pid

Old version runv won't create shim-init.pid, so for handling backward compatibility problem, ignore the old dir for composing POD. Signed-off-by: Zhang Wei <zhangwei555@huawei.com>

Author: WeiZhang555

create.go

@@ -432,7 +432,9 @@ func findSharedContainer(root, nsPath string) (container string, err error) {
 shimPidFile := filepath.Join(absRoot, item.Name(), "shim-init.pid")
 spidByte, err := ioutil.ReadFile(shimPidFile)
 if err != nil {
-return "", fmt.Errorf("failed to read shim pid file %q: %v", shimPidFile, err)
+// for backward compatibility, if dir doesn't contain "shim-init.pid"
+// it could be old legacy dir, ignore and skip it.
+continue
 }
 spid := strings.TrimSpace(string(spidByte))
 if pid == spid {