[bgpd] Fixed as-path prepend/exclude ASN handling

 - aspath_gettoken(): use as_t to fix 4-byte ASN scanning (bug #484)
 - set_aspath_prepend_cmd(): use CMD_AS_RANGE in message to match
   actual range
 - no_set_aspath_prepend_val_cmd(): idem
 - set_aspath_exclude_cmd(): idem
 - no_set_aspath_exclude_val_cmd(): idem
diff --git a/bgpd/bgp_routemap.c b/bgpd/bgp_routemap.c
index bb9014f..d86937b 100644
--- a/bgpd/bgp_routemap.c
+++ b/bgpd/bgp_routemap.c
@@ -3053,7 +3053,7 @@
 
 DEFUN (set_aspath_prepend,
        set_aspath_prepend_cmd,
-       "set as-path prepend .<1-65535>",
+       "set as-path prepend ." CMD_AS_RANGE,
        SET_STR
        "Transform BGP AS_PATH attribute\n"
        "Prepend to the as-path\n"
@@ -3091,7 +3091,7 @@
 
 ALIAS (no_set_aspath_prepend,
        no_set_aspath_prepend_val_cmd,
-       "no set as-path prepend .<1-65535>",
+       "no set as-path prepend ." CMD_AS_RANGE,
        NO_STR
        SET_STR
        "Transform BGP AS_PATH attribute\n"
@@ -3100,7 +3100,7 @@
 
 DEFUN (set_aspath_exclude,
        set_aspath_exclude_cmd,
-       "set as-path exclude .<1-65535>",
+       "set as-path exclude ." CMD_AS_RANGE,
        SET_STR
        "Transform BGP AS-path attribute\n"
        "Exclude from the as-path\n"
@@ -3137,7 +3137,7 @@
 
 ALIAS (no_set_aspath_exclude,
        no_set_aspath_exclude_val_cmd,
-       "no set as-path exclude .<1-65535>",
+       "no set as-path exclude ." CMD_AS_RANGE,
        NO_STR
        SET_STR
        "Transform BGP AS_PATH attribute\n"