am 2c3539e4: save the log from recovery\'s last run in /cache/recovery/last_log

Merge commit '2c3539e4d8251ad91e0b881253d39583680093e8' into gingerbread-plus-aosp

* commit '2c3539e4d8251ad91e0b881253d39583680093e8':
  save the log from recovery's last run in /cache/recovery/last_log