lib/oelite: Allow falling back to OEliteUri.unpack for all fetchers
lib/oelite: Allow falling back to OEliteUri.unpack for all fetchers

Fetchers having their own unpack method can now set the localpath
attribute and have the OEliteUri.unpack method called instead of their
own.

(refs #251)

Signed-off-by: Esben Haabendal <c5ba3f1141bb30a64dd6c7e6726a53a85adc9442@prevas.dk>

hundeboll/core,hundeboll/core,diorcety/oe-lite-core,sknsean/core,hundeboll/core,sknsean/core,sknsean/core,sknsean/core,hundeboll/core,diorcety/oe-lite-core,sknsean/core