[1.8][FLINK-12040][build] Remove unused akka dependencies

[zentol]

Removes a few unused dependencies; mostly to get Apache Camle out of the dependency graph which shows up as vulnerable in security checks.

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Last check on commit 06bb6f5 (Wed Jan 08 15:47:43 UTC 2020)

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[tillrohrmann]

Thanks for creating this PR @zentol. LGTM modulo the akka-camel entry in the parent pom.xml which I believe could be removed.