hammer2 - Misc cluster protocol work
* Adjust debugging a bit so hammer2 -d bumps DMsgDebugOpt to sucessively
higher values.
* mount_hammer2 now connects the hammer2 service daemon to the mount
via localhost instead of via 0 (0 does not bind to localhost if the
machine has an IP address). Allows differentiation between remote
connections and local connections.
* Begin splitting the dmsg iocom stuff off from vfsops.c in the hammer2 VFS
and test.
* Issue SPANs relative to state0 rather than the LNK_CONN state in the hammer2
VFS, to match how SPANs are implemented in the service demon.
* Recognize remote HAMMER2 filesystem SPANs (but don't do anything with them
yet).
* Fix a brace bug in hammer2_bulkscan.c (from swildner).