This is the first cross-cutting, large-scale clang-tidy fix. It runs the
“modernize-use-bool-literal” fixit over all source code compiled in a fairly
full-featured MySQL build, changing integral literals to bool literals when
used in a boolean context. A typical example would be:

-      print_comment(sql_file, 0, "-- Dump completed on %s\n", time_str);
+      print_comment(sql_file, false, "-- Dump completed on %s\n", time_str);

as the second argument to print_comment() is “bool is_error”.

Converting 0 and 1 literals to false and true makes code easier to read by
increasing self-documentation, makes type and argument order mistakes more
difficult, enable compiler warnings when nonsensical operations are attempted
(such as multiplying bools), and reduces noise from IDEs and other tools that
check clang-tidy warnings.

Change-Id: I8070dc592cd0341993d2b4261a3949b71ac5e916