`InterceptMessage` cleanup #1295

Job	Run time
interop-jd-translator	1m 41s
interop-proxy-with-multi-ups	59s
interop-proxy-with-multi-ups-extended	58s
jds-do-not-panic-if-jdc-close-connection	52s
jds-do-not-fail-on-wrong-tsdatasucc	50s
jds-do-not-stackoverflow-when-no-token	1m 6s
jds-receive-solution-while-processing-declared-job	3m 30s
pool-sri-test-1-standard	3m 23s
pool-sri-test-close-channel	2m 16s
pool-sri-test-extended_0	3m 6s
pool-sri-test-extended_1	3m 28s
standard-coverage	3m 34s
pool-sri-test-reject-auth	3m 16s
sv1-test	2m 59s
translation-proxy-broke-pool	2m 31s
translation-proxy-old-share	2m 25s
Aggregate MG Test Results	1s
	36m 55s

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