*: use clang's 'ForEachMacros' format style option

*: use clang's 'ForEachMacros' format style option

This fixes the broken indentation of several foreach loops throughout
the code.

From clang's documentation[1]:
  ForEachMacros: A vector of macros that should be interpreted as foreach
  loops instead of as function calls.

[1] http://clang.llvm.org/docs/ClangFormatStyleOptions.html

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>