Description: when running must-gather command as a subprocess with gather_with_timeout, seems like the timeout does not really take effect.

Steps to reproduce:

1. Create a scenario in which `velero restore describe <restore-name --details` command will hang

2. try to execute the must-gather command from another subshell/subprocess, e.g:

[mperetz@mperetz oadp-e2e-qe]$ cat must_gather 
oc adm must-gather --image=quay.io/konveyor/oadp-must-gather:latest -- /usr/bin/gather_with_timeout 30
[mperetz@mperetz oadp-e2e-qe]$ 
[mperetz@mperetz oadp-e2e-qe]$ bash must_gather    

3. note that the timeout doesn't apply and that the command still hangs

4. try to run the script with "source", e.g `source must-gather`

5. note that the timeout does apply now