TDAQ Module Fixes, master branch (2019.11.05.)

When introducing the TDAQ_PLATFORM cache variable, the modules were not updated to use this new variable everywhere where they should. 😦 This should be fixed now.

At the same time removed all usage of $ENV{CMTCONFIG} from the modules, as that environment variable should really not be used for anything in our builds anymore.

Also made it clear in Finddqm-common.cmake that it should not be used anymore. Didn't remove the module all together (just yet) though, to keep existing configurations in atlas/athena still working, even without a change. The file should be removed at one point in the future though.

This is to fix the RPM installation issue discovered in ATLINFR-2904.

cc. @fwinkl. Though this should really not change anything for any users of TDAQ...