tdb2: rename the tools to tdb2torture, tdb2tool and mktdb2

This means they can be installed in parallel with tdb1's tools.

ccan/tdb2/tools/Makefile

@@ -2,13 +2,13 @@ OBJS:=../../tdb2.o ../../hash.o ../../tally.o
 CFLAGS:=-I../../.. -Wall -g -O3 #-g -pg
 LDFLAGS:=-L../../..
 
-default: tdbtorture tdbtool mktdb speed growtdb-bench
+default: tdb2torture tdb2tool mktdb2 speed growtdb-bench
 
-tdbtorture: tdbtorture.c $(OBJS)
-tdbtool: tdbtool.c $(OBJS)
-mktdb: mktdb.c $(OBJS)
+tdb2torture: tdb2torture.c $(OBJS)
+tdb2tool: tdb2tool.c $(OBJS)
+mktdb2: mktdb2.c $(OBJS)
 speed: speed.c $(OBJS)
 growtdb-bench: growtdb-bench.c $(OBJS)
 
 clean:
-	rm -f tdbtorture tdbtool mktdb speed growtdb-bench
+	rm -f tdb2torture tdb2tool mktdb2 speed growtdb-bench