remove cart specific logs on cart teardown

https://bugzilla.redhat.com/show_bug.cgi?id=1079129
Create app with web cartridge and some other addon cartridges, after
using the app, remove one or some of the addon cartridges. Check the log
for the app, the removed cartridge log still presents under
app-root/logs. The corresponding cartridge log should be removed when
the cartridge was removed.