WL#2936 - Falcon & MySQL plugin interface: server variables

Fix tests when InnoDB is not built-in. Innodb options would cause
mysqld to abort with an error indicating that the option is unknown.
Fix tests on Windows where mysql-test-run.pl was unable to probe
mysqld for version and variables information, caused by output
being redirected to a log file instead.

mysql-test/mysql-test-run.pl

@@ -3784,14 +3784,14 @@ sub mysqld_arguments ($$$$) {
     mtr_add_arg($args, "%s--server-id=%d", $prefix,
 	       $idx > 0 ? $idx + 101 : 1);
 
-    mtr_add_arg($args, "%s--innodb_data_file_path=ibdata1:10M:autoextend",
+    mtr_add_arg($args, "%s--loose-innodb_data_file_path=ibdata1:10M:autoextend",
 		$prefix);
 
     mtr_add_arg($args, "%s--local-infile", $prefix);
 
     if ( $idx > 0 or !$use_innodb)
     {
-      mtr_add_arg($args, "%s--skip-innodb", $prefix);
+      mtr_add_arg($args, "%s--loose-skip-innodb", $prefix);
     }
 
     my $cluster= $clusters->[$mysqld->{'cluster'}];
@@ -3835,7 +3835,7 @@ sub mysqld_arguments ($$$$) {
     mtr_add_arg($args, "%s--report-port=%d", $prefix,
                 $mysqld->{'port'});
     mtr_add_arg($args, "%s--report-user=root", $prefix);
-    mtr_add_arg($args, "%s--skip-innodb", $prefix);
+    mtr_add_arg($args, "%s--loose-skip-innodb", $prefix);
     mtr_add_arg($args, "%s--skip-slave-start", $prefix);
 
     # Directory where slaves find the dumps generated by "load data"

mysql-test/t/binlog_row_mix_innodb_myisam-master.opt

@@ -1 +1 @@
---loose-innodb_lock_wait_timeout=2
+--innodb_lock_wait_timeout=2

mysql-test/t/binlog_stm_mix_innodb_myisam-master.opt

@@ -1 +1 @@
---loose-innodb_lock_wait_timeout=2
+--innodb_lock_wait_timeout=2

mysql-test/t/federated_transactions-slave.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/myisam-blob-master.opt

@@ -1 +1 @@
---max-allowed-packet=24M --skip-innodb --key-buffer-size=1M
+--max-allowed-packet=24M --loose-skip-innodb --key-buffer-size=1M

mysql-test/t/rpl_auto_increment-slave.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/rpl_deadlock_innodb-slave.opt

@@ -1 +1 @@
---innodb --loose-innodb_lock_wait_timeout=4 --slave-transaction-retries=2 --max-relay-log-size=4096
+--innodb --innodb_lock_wait_timeout=4 --slave-transaction-retries=2 --max-relay-log-size=4096

mysql-test/t/rpl_insert_id-slave.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/rpl_insert_id_pk-slave.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/rpl_insert_ignore-slave.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/rpl_multi_engine-slave.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/rpl_ndb_relayrotate-slave.opt

@@ -1,3 +1,3 @@
 -O max_relay_log_size=16384
---innodb
+--loose-innodb
 --log-warnings

mysql-test/t/rpl_read_only-slave.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/rpl_relayrotate-slave.opt

@@ -1,3 +1,3 @@
 -O max_relay_log_size=16384
---innodb
+--loose-innodb
 --log-warnings

mysql-test/t/rpl_row_basic_11bugs-master.opt

@@ -1,2 +1,2 @@
---binlog_ignore_db=test_ignore --innodb
+--binlog_ignore_db=test_ignore --loose-innodb
 

mysql-test/t/rpl_row_basic_11bugs-slave.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/rpl_row_create_table-slave.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/rpl_row_func003-slave.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/rpl_row_sp003-master.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/rpl_row_sp003-slave.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/rpl_stm_000001-slave.opt

@@ -1 +1 @@
---innodb
+--loose-innodb

mysql-test/t/warnings-master.opt

@@ -1 +1 @@
---skip-innodb
+--loose-skip-innodb

sql/mysqld.cc

@@ -3189,8 +3189,12 @@ static int init_server_components()
 
   /* Setup logs */
 
-  /* enable old-fashioned error log */
-  if (opt_error_log)
+  /*
+    Enable old-fashioned error log, except when the user has requested
+    help information. Since the implementation of plugin server
+    variables the help output is now written much later.
+  */
+  if (opt_error_log && !opt_help)
   {
     if (!log_error_file_ptr[0])
       fn_format(log_error_file, pidfile_name, mysql_data_home, ".err",