fix cargo warnings in roles #570

Job	Run time
bad-pool-config-test	3m 15s
interop-jd-translator	2m 3s
interop-proxy-with-multi-ups	58s
interop-proxy-with-multi-ups-extended	54s
jds-do-not-fail-on-wrong-tsdatasucc	2m 32s
jds-do-not-panic-if-jdc-close-connection	54s
jds-do-not-stackoverflow-when-no-token	2m 19s
jds-receive-solution-while-processing-declared-job	3m 36s
pool-sri-test-1-standard	3m 10s
pool-sri-test-close-channel	2m 41s
pool-sri-test-extended_0	3m 11s
pool-sri-test-extended_1	3m 22s
pool-sri-test-reject-auth	3m 18s
standard-coverage	3m 12s
sv1-test	3m 0s
translation-proxy	5m 1s
translation-proxy-broke-pool	2m 44s
translation-proxy-old-share	2m 41s
Aggregate MG Test Results	1s
	48m 52s

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