Revise C++ coding style using clang-format-6.0

Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`.  Use `clang-format` version 6.0.

* 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/CTest/cmCTestGenericHandler.cxx

@@ -100,8 +100,9 @@ bool cmCTestGenericHandler::StartResultingXML(cmCTest::Part part,
   }
   if (!this->CTest->OpenOutputFile(this->CTest->GetCurrentTag(), ostr.str(),
                                    xofs, true)) {
-    cmCTestLog(this->CTest, ERROR_MESSAGE, "Cannot create resulting XML file: "
-                 << ostr.str() << std::endl);
+    cmCTestLog(this->CTest, ERROR_MESSAGE,
+               "Cannot create resulting XML file: " << ostr.str()
+                                                    << std::endl);
     return false;
   }
   this->CTest->AddSubmitFile(part, ostr.str().c_str());