cbfstool: Add -v (verbose) output.

Add -v (verbose) to every command, and allow printing debug messages.

Revise logging and debugging functions (fprintf(stderr,...), dprintf...)
and verbose message printing with following macros:
	ERROR(xxx):	E: xxx
	WARN(xxx)	W: xxx
	LOG(xxx)	xxx
	INFO(...)	INFO: xxx  (only when runs with -v )
	DEBUG(...)	DEBUG: xxx (only when runs with more than one -v)

Example:
	cbfstool coreboot.rom print -v
	cbfstool coreboot.rom add -f file -n file -t raw -v -v

Normal output (especially for parsing) should use printf, not any of these
macros (see usage() and cbfs_locate(), cbfs_print_directory() for example).

Change-Id: I167617da1a6eea2b07075b0eb38e3c9d85ea75dc
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: http://review.coreboot.org/2196
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>

util/cbfstool/compress.c

@@ -50,7 +50,7 @@ comp_func_ptr compression_function(comp_algo algo)
 		compress = lzma_compress;
 		break;
 	default:
-		fprintf(stderr, "E: Unknown compression algorithm %d!\n", algo);
+		ERROR("Unknown compression algorithm %d!\n", algo);
 		return NULL;
 	}
 	return compress;