WL #3670: Compile-time option to remove GRANT-related startup options

- configure --disable-grant-options defines DISABLE_GRANT_OPTIONS
- configure.js/cmake also updated
- if DISABLE_GRANT_OPTIONS is defined, mysqld no longer recognizes:
  --bootstrap
  --init-file
  --skip-grant-tables

Scripts which rely on those three options are modified to check the environment for MYSQLD_BOOTSTRAP; it should be set to the full path of a mysqld which does handle those options.

For example:

$ export MYSQLD_BOOTSTRAP
$ MYSQLD_BOOTSTRAP=/path/to/full/MySQL/bin/mysqld
$ mysql_install_db
$ make test

mysql-test/mysql_test_run_new.c

@@ -292,6 +292,14 @@ void install_db(char *datadir)
     die("Unable to create init_db.sql.");
   /* args */
   init_args(&al);
+  /*
+    XXX: If mysqld is compiled with DISABLE_GRANT_OPTIONS defined, it
+    will not recognize the --bootstrap, --init-file or --skip-grant-
+    tables options.  If this is needed here, please check
+    MYSQLD_BOOTSTRAP in the environment, and use its value instead of
+    mysqld_file if it is set.  See mysql-test-run.pl and
+    mysql_install_db.
+  */
   add_arg(&al, mysqld_file);
   add_arg(&al, "--no-defaults");
   add_arg(&al, "--bootstrap");