Resolve out any symlinks before starting logging

This way site_path can be on NFS, logs/ can be a symlink to a local
disk directory, and the NFS mount can temporarily disappear without
the logging being affected.

Change-Id: I190860237f91ba593bb39e58795d20a42c7cdc0b
Signed-off-by: Shawn O. Pearce <sop@google.com>
2 files changed