log and re-raise error if load unexpectedly fails #5042

Job	Run time
Lint javascript	15s
Lint check	1m 5s
Compile LavinMQ	1m 0s
Format check	11s
Lint OpenAPI	15s
Spec	1m 59s
Spec OS X	2m 42s
Spec FreeBSD	2m 22s
Filters for frontend specs	5s
RabbitMQ java client test	5m 17s
Bunny client test	2m 38s
RabbitMQ HTTP API Ruby client test	50s
Test in release mode	19s
RabbitMQ HTTP API Go client test	56s
Frontend specs	0s
	19m 54s

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