Egress service does not handle invalid nodeSelectors correctly

The egress service nodeSelector parsing does
not take into account wrong values that cause
errors (such as "name part must consist of alphanumeric characters"),
and the controller does not handle them gracefully given a bad input.
when a bad input is given it should log an error and ignore the service

create an egress service with a bad nodeSelector:
"{"nodeSelector":{"matchLabels":{"a:b": "c&"}}}"

ovnkube-master controller does not handle it gracefully

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