1. Run the E2E test with kind(provision various versions of k8s cluster) and MinIO on Github Action
2. Bug fix: the variable "stdoutBuf" is assigned to both "installPluginCmd.Stdout" and "installPluginCmd.Stderr", this causes 'if !strings.Contains(stderrBuf.String(), "Duplicate value")' takes no effect as the "stderrBuf.String()" is always empty
3. Print the stdout and stderr for easy debugging
Signed-off-by: Wenkai Yin(尹文开) <yinw@vmware.com>