test: replace deprecated slab_alloc_arena option

Author: Totktonada

Diff for: unit/suites/box.lua

@@ -3,7 +3,7 @@ os = require('os')
 
 require('console').listen(os.getenv("ADMIN_PORT"))
 box.cfg{
-    listen           = os.getenv("PRIMARY_PORT"),
-    slab_alloc_arena = 0.1,
-    pid_file         = "box.pid",
+    listen       = os.getenv("PRIMARY_PORT"),
+    memtx_memory = 0.1 * 1024^3, -- 0.1 GiB
+    pid_file     = "box.pid",
 }

Diff for: unit/suites/lib/tarantool_server.py

@@ -39,14 +39,14 @@ class RunnerException(object):
 
 class TarantoolServer(object):
     default_tarantool = {
-            "bin":           "tarantool",
-            "logfile":   "tarantool.log",
-            "init":           "init.lua"}
+            "bin":     "tarantool",
+            "logfile": "tarantool.log",
+            "init":    "init.lua"}
 
     default_cfg = {
             "custom_proc_title": "\"tarantool-python testing\"",
-            "slab_alloc_arena":                             0.5,
-            "pid_file":                           "\"box.pid\""}
+            "memtx_memory":      0.5 * 1024**3,  # 0.5 GiB
+            "pid_file":          "\"box.pid\""}
 
     @property
     def logfile_path(self):