test: replication/transaction flakiness fix

The test is expected the replication is broken by the time of the
server switch. Apparently, switch won the race, so the expectation
is changed for waiting.

Closes https://github.com/tarantool/tarantool-qa/issues/271

NO_CHANGELOG=testing
NO_DOC=testing
NO_TEST=testing

(cherry picked from commit 0e181b35)

test/replication/transaction.result

@@ -62,6 +62,11 @@ test_run:cmd("switch replica")
 ---
 - true
 ...
+-- check replication status
+test_run:wait_upstream(1,{status = 'stopped', message_re = 'Duplicate key'})
+---
+- true
+...
 -- nothing was applied
 v1[1] == box.info.vclock[1]
 ---
@@ -73,16 +78,6 @@ box.space.test:select()
   - [2, 'm']
   - [4, 'r']
 ...
--- check replication status
-box.info.replication[1].upstream.status
----
-- stopped
-...
-box.info.replication[1].upstream.message
----
-- Duplicate key exists in unique index "pk" in space "test" with old tuple - [4, "r"]
-  and new tuple - [4, "m"]
-...
 -- set conflict to third transaction
 _ = box.space.test:delete({4})
 ---

test/replication/transaction.test.lua

@@ -26,12 +26,11 @@ box.begin() s:insert({3, 'm'}) s:insert({4, 'm'}) box.commit()
 box.begin() s:insert({5, 'm'}) s:insert({6, 'm'}) s:insert({7, 'm'}) box.commit()
 
 test_run:cmd("switch replica")
+-- check replication status
+test_run:wait_upstream(1,{status = 'stopped', message_re = 'Duplicate key'})
 -- nothing was applied
 v1[1] == box.info.vclock[1]
 box.space.test:select()
--- check replication status
-box.info.replication[1].upstream.status
-box.info.replication[1].upstream.message
 -- set conflict to third transaction
 _ = box.space.test:delete({4})
 box.space.test:replace({6, 'r'})