This patch adds support for restoring symbolic links when camget is
called with the -o option.
This fixes an issue which caused `camget -o' to write an incomplete
snapshot to the target directory when it encountered a symlink.
Note that no attempt is made to restore the symlink metadata since: a)
A symlink's permissions do not matter and are fixed to 1777 on some
systems b) Go's os.Chtimes() always acts on the symlink target c)
os.Chown() is not currently called for any file in the current code.
Tested on Linux.
Change-Id: I7099592dcd5cc513c2685671be6f6b165f8f8053
-osutil: PollParent to monitor parent process.
-camlistored: option to kill itself if it has been orphaned.
Change-Id: I87193254d55847e46134439ecd1b04f71718d083
Brian Gitonga Marete