Move Tile specific PCIe logging to its own file.

Created util-logopenfile-tile.c and util-logopen-tile.h for the TILE
specific PCIe logging functionality.

Using Write and Close function pointers that default to standard write
and close for files and sockets, but are changed to PCIe write and
close functions when a PCIe channel is openned for logging.

Moved Logging contex out of tm-modules.h into util-logopenfile.h,
where it makes more sense. This required including util-logopenfile.h
into a couple of alert-*.c files, which previously were getting the
definitions from tm-modules.h.