Fix for BUG#50081 "Tests: mysqld--help-notwin fails with --parallel":

eliminate 3 more "directory path" variables from the test's output (it was already
the case for other similar ones likes slow-query-log-file).

mysql-test/include/mysqld--help.inc

@@ -11,7 +11,8 @@ exec $MYSQLD_BOOTSTRAP_CMD --symbolic-links=0 --lower-case-table-names=1 --help
 
 perl;
   @skipvars=qw/basedir open-files-limit general-log-file log
-               log-slow-queries pid-file slow-query-log-file/;
+               log-slow-queries pid-file slow-query-log-file
+               datadir slave-load-tmpdir tmpdir/;
   @plugins=qw/innodb ndb ndbcluster safemalloc debug temp-pool ssl des-key-file
               thread-concurrency super-large-pages mutex-deadlock-detector/;
   @env=qw/MYSQLTEST_VARDIR MYSQL_TEST_DIR MYSQL_LIBDIR MYSQL_SHAREDIR/;

mysql-test/r/mysqld--help-notwin.result

@@ -744,7 +744,6 @@ completion-type                     NO_CHAIN
 concurrent-insert                   AUTO
 connect-timeout                     10
 console                             FALSE
-datadir                             MYSQLTEST_VARDIR/install.db/
 date-format                         %Y-%m-%d
 datetime-format                     %Y-%m-%d %H:%i:%s
 default-character-set               latin1
@@ -898,7 +897,6 @@ skip-show-database                  FALSE
 skip-slave-start                    FALSE
 slave-compressed-protocol           FALSE
 slave-exec-mode                     STRICT
-slave-load-tmpdir                   MYSQLTEST_VARDIR/tmp/
 slave-net-timeout                   3600
 slave-skip-errors                   (No default value)
 slave-transaction-retries           10
@@ -926,7 +924,6 @@ thread-stack                        262144
 time-format                         %H:%i:%s
 timed-mutexes                       FALSE
 tmp-table-size                      16777216
-tmpdir                              MYSQLTEST_VARDIR/tmp/
 transaction-alloc-block-size        8192
 transaction-isolation               REPEATABLE-READ
 transaction-prealloc-size           4096

mysql-test/r/mysqld--help-win.result

@@ -748,7 +748,6 @@ completion-type                   NO_CHAIN
 concurrent-insert                 AUTO
 connect-timeout                   10
 console                           FALSE
-datadir                           MYSQLTEST_VARDIR/install.db/
 date-format                       %Y-%m-%d
 datetime-format                   %Y-%m-%d %H:%i:%s
 default-character-set             latin1
@@ -904,7 +903,6 @@ skip-show-database                FALSE
 skip-slave-start                  FALSE
 slave-compressed-protocol         FALSE
 slave-exec-mode                   STRICT
-slave-load-tmpdir                 MYSQLTEST_VARDIR/tmp/
 slave-net-timeout                 3600
 slave-skip-errors                 (No default value)
 slave-transaction-retries         10
@@ -932,7 +930,6 @@ thread-stack                      262144
 time-format                       %H:%i:%s
 timed-mutexes                     FALSE
 tmp-table-size                    16777216
-tmpdir                            MYSQLTEST_VARDIR/tmp/
 transaction-alloc-block-size      8192
 transaction-isolation             REPEATABLE-READ
 transaction-prealloc-size         4096