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-table-checksum/progress.t

@@ -91,7 +91,8 @@ like(
    "Checksumming continues after waiting for slave lag"
 );
 
-is(
+# This test randomly fails, we need to know the reason
+diag($output) if not is(
    PerconaTest::count_checksum_results($output, 'errors'),
    0,
    "No errors after waiting for slave lag"