log and re-raise error if load unexpectedly fails #5031

Job	Run time
Spec FreeBSD	2m 27s
Lint check	1m 12s
Format check	12s
Compile LavinMQ	1m 7s
Filters for frontend specs	5s
Lint javascript	17s
Lint OpenAPI	18s
Spec OS X	2m 32s
Spec	2m 11s
RabbitMQ java client test	5m 20s
Bunny client test	2m 30s
RabbitMQ HTTP API Go client test	1m 6s
Test in release mode	37s
RabbitMQ HTTP API Ruby client test	49s
Frontend specs	0s
	20m 43s

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