tests: add SQL tests

Added SQL tests. Updated config.lua for creation the space for
using SQL in tests. Added the check of Tarantool version to skip SQL
tests if tarantool version < 2.0.0.

Changed id of the test spaces with id=512 and id=514, cause if using SQL
in tarantool there is no ability to set space id explicitly, so it gets created
with id=512 by default and conflicts with already existing space with the same id.

Follows up #62

Author: vr009

README.md

@@ -184,7 +184,7 @@ import (
 )
 
 func main() {
-	spaceNo := uint32(512)
+	spaceNo := uint32(515)
 	indexNo := uint32(0)
 
 	server := "127.0.0.1:3013"

config.lua

@@ -6,13 +6,13 @@ box.cfg{
 
 box.once("init", function()
     local s = box.schema.space.create('test', {
-        id = 512,
+        id = 515,
         if_not_exists = true,
     })
     s:create_index('primary', {type = 'tree', parts = {1, 'uint'}, if_not_exists = true})
 
     local st = box.schema.space.create('schematest', {
-        id = 514,
+        id = 516,
         temporary = true,
         if_not_exists = true,
         field_count = 7,
@@ -49,6 +49,10 @@ box.once("init", function()
     box.schema.user.grant('test', 'execute', 'universe')
     box.schema.user.grant('test', 'read,write', 'space', 'test')
     box.schema.user.grant('test', 'read,write', 'space', 'schematest')
+
+    -- grants for sql tests
+    box.schema.user.grant('test', 'create,read,write,drop,alter', 'space')
+    box.schema.user.grant('test', 'create', 'sequence')
 end)
 
 local function simple_incr(a)

example_test.go

@@ -42,7 +42,7 @@ func ExampleConnection_Select() {
 		return
 	}
 	defer conn.Close()
-	resp, err := conn.Select(512, 0, 0, 100, tarantool.IterEq, []interface{}{uint(1111)})
+	resp, err := conn.Select(515, 0, 0, 100, tarantool.IterEq, []interface{}{uint(1111)})
 	if err != nil {
 		fmt.Printf("error in select is %v", err)
 		return
@@ -68,7 +68,7 @@ func ExampleConnection_SelectTyped() {
 	}
 	defer conn.Close()
 	var res []Tuple
-	err = conn.SelectTyped(512, 0, 0, 100, tarantool.IterEq, tarantool.IntKey{1111}, &res)
+	err = conn.SelectTyped(515, 0, 0, 100, tarantool.IterEq, tarantool.IntKey{1111}, &res)
 	if err != nil {
 		fmt.Printf("error in select is %v", err)
 		return
@@ -86,7 +86,7 @@ func ExampleConnection_SelectTyped() {
 }
 
 func Example() {
-	spaceNo := uint32(512)
+	spaceNo := uint32(515)
 	indexNo := uint32(0)
 
 	server := "127.0.0.1:3013"