Trigger: enable flake8

Enable flake8 for the Trigger packages where this was not the case yet. Apply mostly trivial fixes to code. Includes some large tab->space replacements to avoid mixed indentation.

HLT/HLTUtils/CMakeLists.txt

@@ -6,7 +6,7 @@
 atlas_subdir( HLTUtils )
 
 # Install files from the package:
-atlas_install_python_modules( python/*.py )
+atlas_install_python_modules( python/*.py POST_BUILD_CMD ${ATLAS_FLAKE8} )
 atlas_install_scripts( 
   share/make_hlt_rep.py
   share/make_coralServer_rep.py