executor/pdu: handle EasySNMPError exceptions better
Catch EasySNMPError exceptios and re-try 3 times before giving up.
Fixes: https://gitlab.freedesktop.org/mupuf/valve-infra/-/issues/111
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Catch EasySNMPError exceptios and re-try 3 times before giving up.
Fixes: https://gitlab.freedesktop.org/mupuf/valve-infra/-/issues/111