Revise C++ coding style using clang-format

Run the `Utilities/Scripts/clang-format.bash` script to update
all our C++ code to a new style defined by `.clang-format`.
Use `clang-format` version 3.8.

* If you reached this commit for a line in `git blame`, re-run the blame
  operation starting at the parent of this commit to see older history
  for the content.

* See the parent commit for instructions to rebase a change across this
  style transition commit.

Source/cmEnableTestingCommand.cxx

@@ -14,8 +14,8 @@
 // we do this in the final pass so that we now the subdirs have all
 // been defined
 bool cmEnableTestingCommand::InitialPass(std::vector<std::string> const&,
-                                         cmExecutionStatus &)
+                                         cmExecutionStatus&)
 {
-  this->Makefile->AddDefinition("CMAKE_TESTING_ENABLED","1");
+  this->Makefile->AddDefinition("CMAKE_TESTING_ENABLED", "1");
   return true;
 }