Add tests from develop

Added tests from develop. The test results need to be modified for 2.0.

maxscale-system-test/fw2/deny1

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+drop table if exists t1;
+create table t1(id int);
+alter table t1 add column b int;

maxscale-system-test/fw2/deny2

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+grant select on *.* to 'skysql'@'localhost';
+revoke select on *.* from 'skysql'@'localhost';

maxscale-system-test/fw2/deny3

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+use test;
+load data local infile 'test.csv' into table test.t1;

maxscale-system-test/fw2/deny4

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+select sum(1) from test.t1;
+select avg(1) from test.t1;
+select sum(avg(1)) from test.t1;
+select my_function(1) from test.t1;
+select my_function("1") from test.t1;
+select * from test.t1 where 1 = 1;
+select * from test.t1 where 1 >= 1;
+select * from test.t1 where 1 <= 1;
+select * from test.t1 where 1 != 1;
+select * from test.t1 where 1 <> 1;

maxscale-system-test/fw2/pass1

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+select * from mysql.user;
+use mysql;
+set @var = 1;

maxscale-system-test/fw2/pass2

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+select * from mysql.user;
+use mysql;
+set @var = 1;

maxscale-system-test/fw2/pass3

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+select * from mysql.user;
+set @var = 1;

maxscale-system-test/fw2/pass4

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+create or replace table test.t1(id int);
+create function my_function (arg int) returns int deterministic return arg * arg;
+select "sum(1)";
+select (1);
+select * from(select 1) as a;

maxscale-system-test/fw2/rules1

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+rule test1 deny regex '.*' on_queries drop
+rule test2 deny regex '.*' on_queries create
+rule test3 deny regex '.*' on_queries alter
+users %@% match any rules test1 test2 test3

maxscale-system-test/fw2/rules2

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+rule test1 deny regex '.*' on_queries grant
+rule test2 deny regex '.*' on_queries revoke
+users %@% match any rules test1 test2

maxscale-system-test/fw2/rules3

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+rule test1 deny regex '.*' on_queries use
+rule test2 deny regex '.*' on_queries load
+users %@% match any rules test1 test2

maxscale-system-test/fw2/rules4

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+rule test1 deny function sum avg on_queries select
+rule test2 deny function my_function on_queries select
+rule test3 deny function = >= <= != <> on_queries select
+users %@% match any rules test1 test2 test3