log and re-raise error if load unexpectedly fails #5032

Job	Run time
Lint javascript	16s
Format check	13s
Compile LavinMQ	1m 6s
Spec FreeBSD	2m 35s
Lint check	1m 3s
Lint OpenAPI	15s
Spec	2m 4s
Filters for frontend specs	2s
Spec OS X	3m 23s
RabbitMQ HTTP API Go client test	1m 1s
RabbitMQ java client test	5m 11s
Test in release mode	17s
Bunny client test	2m 55s
RabbitMQ HTTP API Ruby client test	51s
Frontend specs	0s
	21m 12s

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