PT-2156 Fix tests for lib (#606)

* PT-2156 - Fix tests for lib

- Fixed tests broken for lib/TableParser.pm after fix for PT-1059
- Updated tests for lib/TableParser.pm that are broken due to SHOW CREATE TABLE output format change in 8.0
- Updated modules for all tools that use lib/TableParser.pm

* Revert "Fixed pt-archiver tests"

This reverts commit a3ab87b12e.

This commit wa needed, because removed code in sandbox/slave_channels.sql broked the test. Proper fix would be to do not remove channel names rather than chaging the test. So revertig it.

* PT-2156 - Fix tests for lib

- Updated test t/lib/TableChecksum.t so it reflects changes, introduced in the fix for PT-2016
- Updated test t/lib/RowChecksum.t so it reflects changes added to in the fix for PT-2138: UTF8 support
- Uncommented SQL in sandbox/slave_channels.sql that made t/lib/MasterSlave.t to fail
- Added check for undef into t/pt-archiver/archive_using_channels.t
- Updated lib/Cxn.pm so it uses $dbh->{Active} after issue with the ping() call, reported at https://github.com/perl5-dbi/DBD-mysql/issues/306

* PT-2156 - Fix tests for lib

- Impoved the fix for PT-2016, so it does not files with keys with USING keyword
- Added brackets to expression in lib/TableNibbler.pm, so it does not crap query wit many indexes with OR keyword
- Adjusted test t/lib/TableNibbler.t, so it reflects above chages
- Modified lib/Cxn.pm, so it has workaround for https://github.com/perl5-dbi/DBD-mysql/issues/306 , introduced in DBD::mysql 4.0.50
- Updated tests: added debugging code and cleanups
- Updated modules for tools

t/pt-archiver/archive_using_channels.t

@@ -28,7 +28,7 @@ elsif ( !$slave_dbh ) {
 } elsif ($sandbox_version lt '5.7') {
    plan skip_all => 'Only on MySQL 5.7+';
 } else {
-   plan tests => 4;
+   plan tests => 5;
 }
 
 my ($master1_dbh, $master1_dsn) = $sb->start_sandbox(
@@ -76,10 +76,19 @@ $output = output(
    sub { $exit_status = pt_archiver::main(@args) },
    stderr => 1,
 );
-is(
+diag("Exit status: $exit_status") if ($exit_status);
+diag($output);
+
+isnt(
     $exit_status,
     0,
-    'No need of channel name since there is only one master',
+    'Must specify a channel name',
+);
+
+like (
+    $output,
+    qr/"channel" was not specified/,
+    'Message saying channel name must be specified'
 );
 
 push @args, ('--channel', 'masterchan1');