Tests: unit_stop() removed where possible.

Since wait_for_record() was introduced there is no need
to stop Unit before parsing unit.log.

test/test_perl_application.py

@@ -2,7 +2,6 @@ import re
 
 import pytest
 
-from conftest import unit_stop
 from unit.applications.lang.perl import TestApplicationPerl
 
 
@@ -119,8 +118,6 @@ class TestPerlApplication(TestApplicationPerl):
 
         assert self.get()['body'] == '1', 'errors result'
 
-        unit_stop()
-
         assert (
             self.wait_for_record(r'\[error\].+Error in application')
             is not None