Create a separate copy of the fsck logs

The log_target parameter of android_fork_execvp_ext() is now a
bit field, and multiple targets can be set to log to multiple
places at the same time.

The new target LOG_FILE will log to a file specified by the new
parameter file_path.

Set LOG_FILE and log to a file in /dev (the only writable filesystem
avilable when e2fsck runs) when invoking e2fsck in fs_mgr.

Bug: 10021342

Change-Id: I63baf644cc8c3afccc8345df27a74203b44d0400
5 files changed