MDEV-18591: mysql_install_db - pass --log-error to mysqld in install (#2363)

Previously we parsed it out in mysql_install_db for use in the error
message, but failed to pass it to mysqld in the bootstrap.

Also match log_error as it might appear in the .cnf files.

Thanks Michal Schorm for the test case.

Reviewed by: Faustin Lammler

scripts/mysql_install_db.sh

@@ -148,7 +148,9 @@ parse_arguments()
       --builddir=*) builddir=`parse_arg "$arg"` ;;
       --srcdir=*)  srcdir=`parse_arg "$arg"` ;;
       --ldata=*|--datadir=*|--data=*) ldata=`parse_arg "$arg"` ;;
-      --log-error=*)
+      --log[-_]error=*)
+       # Keep in the arguments passed to the server
+       args="$args $arg"
        log_error=`parse_arg "$arg"` ;;
         # Note that the user will be passed to mysqld so that it runs
         # as 'user' (crucial e.g. if log-bin=/some_other_path/