python-adb: Fallback to getprop when /system/build.prop is not readable.

Bug: 765679
Change-Id: Ib5e65ea798231b0d99679322f37c98d0b0f32778
Reviewed-on: https://chromium-review.googlesource.com/671933
Reviewed-by: Marc-Antoine Ruel <[email protected]>
1 file changed