Bug #49210 Enable MTR timeout configuration through environment variables

Define env. vars for both timeout settings
Also incorporated 5.0 patch into mtr version 1

mysql-test/lib/v1/mysql-test-run.pl

@@ -1102,14 +1102,16 @@ sub command_line_setup () {
 
   if ( ! $opt_testcase_timeout )
   {
-    $opt_testcase_timeout= $default_testcase_timeout;
+    $opt_testcase_timeout=
+      $ENV{MTR_TESTCASE_TIMEOUT} || $default_testcase_timeout;
     $opt_testcase_timeout*= 10 if $opt_valgrind;
     $opt_testcase_timeout*= 10 if ($opt_debug and $glob_win32);
   }
 
   if ( ! $opt_suite_timeout )
   {
-    $opt_suite_timeout= $default_suite_timeout;
+    $opt_suite_timeout=
+      $ENV{MTR_SUITE_TIMEOUT} || $default_suite_timeout;
     $opt_suite_timeout*= 6 if $opt_valgrind;
     $opt_suite_timeout*= 6 if ($opt_debug and $glob_win32);
   }

mysql-test/mysql-test-run.pl

@@ -198,10 +198,10 @@ my $opt_mark_progress;
 
 my $opt_sleep;
 
-my $opt_testcase_timeout=    15; # minutes
-my $opt_suite_timeout   =   300; # minutes
-my $opt_shutdown_timeout=    10; # seconds
-my $opt_start_timeout   =   180; # seconds
+my $opt_testcase_timeout= $ENV{MTR_TESTCASE_TIMEOUT} ||  15; # minutes
+my $opt_suite_timeout   = $ENV{MTR_SUITE_TIMEOUT}    || 300; # minutes
+my $opt_shutdown_timeout= $ENV{MTR_SHUTDOWN_TIMEOUT} ||  10; # seconds
+my $opt_start_timeout   = $ENV{MTR_START_TIMEOUT}    || 180; # seconds
 
 sub testcase_timeout { return $opt_testcase_timeout * 60; };
 sub suite_timeout { return $opt_suite_timeout * 60; };