skip master-replica tests if popen is not supported

Since version 2.4.1, Tarantool has the popen built-in module
that supports execution of external programs.
popen() uses in tests for creating replica instance.

Author: 0x501D

t/200-master-replica.t

@@ -1,6 +1,7 @@
 #!/usr/bin/env tarantool
 
 local fio   = require('fio')
+local log   = require('log')
 local tnt   = require('t.tnt')
 local test  = require('tap').test('')
 local uuid  = require('uuid')
@@ -10,6 +11,12 @@ local fiber = require('fiber')
 local queue_state = require('queue.abstract.queue_state')
 rawset(_G, 'queue', require('queue'))
 
+local qc = require('queue.compat')
+if not qc.check_version({2, 4, 1}) then
+    log.info('Tests skipped, tarantool version < 2.4.1')
+    return
+end
+
 test:plan(12)
 
 local engine = os.getenv('ENGINE') or 'memtx'

t/tnt/init.lua

@@ -3,7 +3,6 @@ local log    = require('log')
 local yaml   = require('yaml')
 local errno  = require('errno')
 local fiber  = require('fiber')
-local popen  = require('popen')
 local netbox = require('net.box')
 
 local dir     = os.getenv('QUEUE_TMP')
@@ -46,6 +45,11 @@ local function tnt_prepare(cfg_args)
 end
 
 local function tnt_cluster_prepare(cfg_args)
+    if not qc.check_version({2, 4, 1}) then
+        error('this test requires tarantool >= 2.4.1')
+        return false
+    end
+
     -- prepare master
     cfg_args = cfg_args or {}
     local files = fio.glob(fio.pathjoin(dir, '*'))
@@ -101,7 +105,7 @@ local function tnt_cluster_prepare(cfg_args)
         '}'
     }
 
-    replica = popen.new(cmd_replica, {
+    replica = require('popen').new(cmd_replica, {
         stdin = 'devnull',
         stdout = 'devnull',
         stderr = 'devnull',
@@ -173,7 +177,6 @@ return {
             for _, file in pairs(files) do
                 log.info("remove %s", file)
                 fio.unlink(file)
-                print("clean replica " .. file)
             end
         end
         if replica then