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/install_test_db.sh

@@ -55,14 +55,17 @@ fi
 mdata=$data/mysql
 EXTRA_ARG=""
 
-if test ! -x $execdir/mysqld
+mysqld=
+if test -x $execdir/mysqld
 then
+  mysqld=$execdir/mysqld
+else
   if test ! -x $libexecdir/mysqld
   then
     echo "mysqld is missing - looked in $execdir and in $libexecdir"
     exit 1
   else
-    execdir=$libexecdir
+    mysqld=$libexecdir/mysqld
   fi
 fi
 
@@ -88,8 +91,11 @@ basedir=.
 EXTRA_ARG="--language=../sql/share/english/ --character-sets-dir=../sql/share/charsets/"
 fi
 
-mysqld_boot=" $execdir/mysqld --no-defaults --bootstrap --skip-grant-tables \
-    --basedir=$basedir --datadir=$ldata --skip-innodb --skip-ndbcluster --skip-bdb \
+mysqld_boot="${MYSQLD_BOOTSTRAP-$mysqld}"
+
+mysqld_boot="$mysqld_boot --no-defaults --bootstrap --skip-grant-tables \
+    --basedir=$basedir --datadir=$ldata \
+    --skip-innodb --skip-ndbcluster --skip-bdb \
     $EXTRA_ARG"
 echo "running $mysqld_boot"