Force restart before maria_showlog_error to get rid of status from previous connections

This fixes a race condition in the test system

mysql-test/include/maria_empty_logs.inc:
  Added comment
mysql-test/include/wait_for_status_var.inc:
  Fixed type in variable name. Add ' around variables for better error message
mysql-test/mysql-test-run.pl:
  Remove -skip-falcon (not to be used), add skip-pbxt to bootstrap
mysql-test/suite/maria/t/maria_showlog_error-master.opt:
  Force restart before maria_showlog_error to get rid of status from previous connection

mysql-test/include/maria_empty_logs.inc

 # Maria help script.
 # Cleans up all logs to give recovery a fresh start.
-
+#
+# Note that this script relies on the number of threads connect at start of
+# this script, so one should run this script with a freshly started server
+# for it to work.
+#
 # API: set mel_keep_control_file=1 if want to keep control file;
 # uses vardir, port and socket.
 

mysql-test/include/wait_for_status_var.inc

@@ -51,11 +51,12 @@ if (`SELECT '$_status_var_comparsion' = ''`)
 }
 
 let $_show_status_value= query_get_value("SHOW $status_type STATUS LIKE '$status_var'", Value, 1);
+
 while (`SELECT NOT('$_show_status_value' $_status_var_comparsion '$status_var_value')`)
 {
   if (!$_status_timeout_counter)
   {
-    --echo **** ERROR: failed while waiting for $status_type $status_var $_status_var_comparison $status_var_value ****
+    --echo **** ERROR: failed while waiting for '$status_type' '$status_var' $_status_var_comparsion '$status_var_value' ****
     --echo Note: the following output may have changed since the failure was detected
     --echo **** Showing STATUS, PROCESSLIST ****
     eval SHOW $status_type STATUS LIKE '$status_var';

mysql-test/mysql-test-run.pl

@@ -2826,7 +2826,7 @@ sub mysql_install_db {
   mtr_add_arg($args, "--basedir=%s", $install_basedir);
   mtr_add_arg($args, "--datadir=%s", $install_datadir);
   mtr_add_arg($args, "--loose-skip-innodb");
-  mtr_add_arg($args, "--loose-skip-falcon");
+  mtr_add_arg($args, "--loose-skip-pbxt");
   mtr_add_arg($args, "--loose-skip-ndbcluster");
   mtr_add_arg($args, "--loose-skip-maria");
   mtr_add_arg($args, "--disable-sync-frm");

mysql-test/suite/maria/t/maria_showlog_error-master.opt

+--force-restart