Add a bit of cache to commandTest
Issue #2014519 by helmo, clemens.tolboom: Fixed SQLite test fails due to missing path while restoring database.
Issue #2027703 by jonhattan: Fixed Drush make --prepare-install doesn't retain chmod values.
Issue #934472 by c960657, greg.1.anderson | robertDouglass: Fixed memcache is not cleared on 'drush cc theme'.
Avoid printing out spurrious DRUSH_BACKEND packets when talking to an older version of drush in 'interactive' mode.  Spurrious end-of-line characters remain, but this is still an improvement.  (Upgrade the remote drush to get rid of them.)
In drush uli, call remote user-login command with 'integrate' => FALSE to avoid duplicate output.
Issue #1979876 by kostajh: Fixed security-only option not used for pm-updatestatus.