InDetDetDescr+InDetConditions: cmake cleanup

Frank Winklmeierrequested to merge
fwinkl/athena:cmake_indet1 into master

cmake cleanup of InnerDetector/InDetDetDescr and InnerDetector/InDetConditions packages:

  • remove atlas_depends_on_subdirs
  • update external and link dependencies
  • do not install component headers
  • enable flake8 where applicable
Edited by Frank Winklmeier

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