Implement podman-remote rm

* refactor command output to use one function
* Add new worker pool parallel operations
* Implement podman-remote umount
* Refactored podman wait to use printCmdOutput()

Signed-off-by: Jhon Honce <jhonce@redhat.com>

test/utils/utils.go

@@ -311,6 +311,8 @@ func (s *PodmanSession) IsJSONOutputValid() bool {
 // WaitWithDefaultTimeout waits for process finished with defaultWaitTimeout
 func (s *PodmanSession) WaitWithDefaultTimeout() {
 	s.Wait(defaultWaitTimeout)
+	os.Stdout.Sync()
+	os.Stderr.Sync()
 	fmt.Println("output:", s.OutputToString())
 }