`InterceptMessage` cleanup #1303

Job	Run time
interop-jd-translator	1m 32s
interop-proxy-with-multi-ups	1m 6s
interop-proxy-with-multi-ups-extended	56s
jds-do-not-fail-on-wrong-tsdatasucc	51s
jds-do-not-panic-if-jdc-close-connection	51s
jds-do-not-stackoverflow-when-no-token	1m 1s
jds-receive-solution-while-processing-declared-job	3m 29s
pool-sri-test-1-standard	3m 32s
pool-sri-test-close-channel	2m 15s
pool-sri-test-extended_0	3m 2s
pool-sri-test-extended_1	8m 17s
pool-sri-test-reject-auth	3m 25s
standard-coverage	3m 27s
sv1-test	2m 51s
translation-proxy-broke-pool	2m 24s
translation-proxy-old-share	2m 26s
Aggregate MG Test Results	1s
	41m 26s

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