On some systems the temporary directory may still be "busy" after WA is
don't with it. Since it's just an empty dir and it will be reused on the
subsequent runs; do check if rm -rf succeeded.
The default value for buffer_size_file contained a path under "/d/",
which is an Android-specific alias for "/sys/kernel/debug". This commit
updates the default value to use the system-agnostic path.
Updating SysfsExtractor with a parameter to explicitly enable/disable
tempfs caching. Previously, this was determined entirely by whether the
device is rooted.
