Replaced RWSplit parameters write_ses_variables_to_all and read_ses_variables_from_slaves with

use_sql_variables_in=[master|all] (default all)
Modified MaxScale Configuration And Usage Scenarios-Z3.pdf and MaxScale_template.cnf accordingly.
Fixed typo in server/modules/routing/readwritesplit/test/rwsplit.sh

server/modules/routing/readwritesplit/test/rwsplit.sh

@@ -279,9 +279,9 @@ do
 	printf "."
     fi
     b=`$RUNCMD < $TINPUT 2>&1`
-    if [[ "`echo "$b"|grep -i 'null|error'`" != "" ]]
+    if [[ "`echo "$b"|grep -i 'null\|error'`" != "" ]]
     then
-	err=`echo "$b" | grep -i null|error`
+	err=`echo "$b" | grep -i null\|error`
 	break
     fi
 done