[Dextrose] [PATCH sugar] don't delete bundles on storage media (SL #2456)

[Aleksey Lim]

For sugar, there is also
http://git.sugarlabs.org/sugar/mainline/commit/bcebef6fb02f20f1ac456cbc43c7ab3062f2d962
to fix http://bugs.sugarlabs.org/ticket/1759 ticket.

I took a look to dextrose 3G related patch and it looks different to
sugar master code. Anyone who are familar w/ 3G patch, please take a
look ot mentined commit if it is needed for dx-2.

-- 
Aleksey