Revert "Issue #2577821 by derek.deraps: Add "Serial Launcher Thread" column to CTools Export UI class"

This reverts commit 6ec15498.

Log catched runtime exception in watchdog.

Catch the runtime exception from thrown in commit
45ec7aaa in hook_requirements().

This will avoid having broken admin/config and admin/reports/status
pages when the error occurs.

array_replace_recursive() git introduced in PHP 5.3 and the minimum
requirement for the module anyway.

For some reason we don't always get a plugin from ctools_get_plugins()
and/or ctools_plugin_get_class(). This looks like a broken cache in
ctools somewhere. The root cause might be
https://www.drupal.org/node/2598166.

This fix introduces a more defensive behaviour around assuming we loaded
a plugin.

We won't avoid errors but will throw a runtime exception instead of
getting a white screen of death.

git authored Aug 05, 2016 and Arne Jørgensen committed Aug 05, 2016

Issue #2276661 by Andy_D, czigor, sergiu.savva: String data, right truncated: 1406 Data too long for column 'msg'

We lower the watchdog level from WATCHDOG_ERROR to WATCHDOG_NOTICE.

It is not an error causing jobs not to be launched during maintenance
mode but the intended behavior of Ultimate Cron.

Although it is a normal behavior it is still a significant condition and
that's why we log it as WATCHDOG_NOTICE.

This will actually not result in fever entries in the watchdog, but it
will move this to a lower level and thus make it easier filter only the
more serious events.

... since that's where it's actually stored in this case ...

Fix bug in getNextSchedule() and add tests.

UnitTestCase cannot access DB, hence we cannot use
db dependent functions such as module_load_include(), etc.