nodeattr: increase hostlist buffer size

Problem: As clusters get larger, some internal buffers used by
hostlist API functions are now too small.

Increase the buffer used in nodeattr from 1K to 64K, matching what
is used in libgenders.

Fixes #62

src/nodeattr/nodeattr.c

@@ -106,7 +106,7 @@ static char *_node_create(genders_t gp);
 static char *_attr_create(genders_t gp);
 #endif
 
-#define HOSTLIST_BUFLEN 1024
+#define HOSTLIST_BUFLEN 65536
 
 int
 main(int argc, char *argv[])