Control: enable thread-checker for several packages

Frank Winklmeierrequested to merge
fwinkl/athena:control_thrchk into master

Enabled the thread-checker for several packages under Control/. Mostly trivial const fixes. The only non-trivial change is to replace the std random number generation (which is not really thread-safe) in AthExHive with AthRNGSvc. While it doesn't really matter here, better not to give a bad example.

Edited by Frank Winklmeier

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