eat: Use /cache if possible

 * Check the size of /cache and use it if possible.

Change-Id: I72fecf3f8d2311c04e63fe81a7ca9a8a6a40419d
Fix fallback branch search in roomservice

If you provided a fallback branch to roomservice via the
ROOMSERVICE_BRANCHES environment var the branch search would fail
if the device repo had any tags.

Fixed this by appending the tag search results to the branch
search results instead of overwriting them

Change-Id: I73a11af1500bd04e346f08ec3f83454502f3a169
fix path to sounds in sdk product

This is necessary to build the SDK:

    lunch sdk-eng && make sdk

Change-Id: I7b9dcfc418ddc46e2967b627525d042bbf6334e1