Don't cache clear after updb

[xendk]

Updb has already done it.

[xendk]

...and it does it even when it doesn't run any updates, so we only need to let cc all detect if it has run.

[arnested]

I remember seeing some versions around that only did a cc all if updb ran update_hooks. Don't remember which, though.

[xendk]

If the recent Drush versions (6+) always clear cache, I'm willing to overlook older versions not doing it.

[arnested]

% drush updb --yes
4 byte UTF-8 for mysql is disabled. See the documentation on adding 4 byte UTF-8 support for more information. (Currently using Database 4 byte UTF-8 support Disabled)                     [warning]

No database updates required                                                                                                                                                                [success]
% drush version
 Drush Version   :  8.1.2

No cc all.

[xendk]

Well, fuck you Drush...

Save detecting whether cc all cleared cache, this is unfixable then.