DRUPAL-367

Remove all subthemes of a centrally managed theme from the Update
manager. This prevents an Undefined index Notice when a locally
installed theme has a centrally managed one as base (e.g., CERN
Overwrite Theme).

See DRUPAL-65

Implement hook_update_projects_alter() to remove all centrally managed
modules and themes from the Update manager. Those which are located
under ^sites/all/.

The hook doesn't work for modules whose module name does not match the
project name. A workaround would be far more extended than these few
lines of code. Another workaround would be to remove them individually
which wouldn't be extensible. So the best option is to follow a policy
to always match the module and project names (see
https://www.drupal.org/node/2821041 and DRUPAL-76)

The list_themes() function makes the unset operation easier for themes
because it returns a list of objects with all the related information
(i.e. path and project name). Still there was an error dues to a
single theme (cern_default) that isn't related to a project but this
was fixed with an if condition.

Related to DRUPAL-65.

Fix for module google analytics that appears as local on Modules Update page when should not (due mismatch between project id google_analytics and file names googleanalytics)

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