python: Several enhancements

Common:
Extract get_product
Extract analyze_issue, and enhance it
Make all adb commands go through single function

aosp-stable:
Distinguish device and device_type
Remove disable_2nd_arch support

x64-upstream:
support analyze
x64-upstream: Remove duplicated filter for content_unittests
aosp-stable: Remove incognito patch as it's been fixed
aosp-stable: Fix the usage of device_type during backup
Merge remote-tracking branch 'gy/master'