Prevent recording samples from piling up

[kc7bfi]

Make sure samples do not pile up in queue

[jenkinskurento]

Hi there. Thanks for your PR.

I'm waiting for a Kurento member to verify that this patch is reasonable to test. If it is, they should reply with check out please on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

[jenkinskurento]

There were errors, for info, please see...