Make get_about_memory.py and get_gc_cc_logs.py pull GC/CC logs properly on phones running b2g18.

The problem is that phones on b2g18 dump GC/CC logs into
/data/local/tmp, and we were only looking in
/data/local/tmp/memory-reports.
Add --no-dmd to get_about_memory.py.
Fix get_about_memory.py so it works on the emulator.
Add to support wasabi device.
Merge branch 'master' of https://github.com/mozilla-b2g/B2G