test: fix double definition variable "local space"

Author: LeonidVas

test/shared/box.lua

@@ -97,23 +97,23 @@ box.once('initialization', function()
         parts  = {2, compat.unsigned, 3, compat.string}
     })
 
-    local space = box.schema.space.create('msgpack')
-    space:create_index('primary', {
+    local space_msgpack = box.schema.space.create('msgpack')
+    space_msgpack:create_index('primary', {
         parts = {1, compat.unsigned}
     })
-    space:insert{1, 'float as key', {
+    space_msgpack:insert{1, 'float as key', {
         [2.7] = {1, 2, 3}
     }}
-    space:insert{2, 'array as key', {
+    space_msgpack:insert{2, 'array as key', {
         [{2, 7}] = {1, 2, 3}
     }}
-    space:insert{3, 'array with float key as key', {
+    space_msgpack:insert{3, 'array with float key as key', {
         [{
             [2.7] = 3,
             [7]   = 7
         }] = {1, 2, 3}
     }}
-    space:insert{6, 'array with string key as key', {
+    space_msgpack:insert{6, 'array with string key as key', {
         ['megusta'] = {1, 2, 3}
     }}