Partial-Bug: 1464016 RD should not contain number in hex format

Fore IPv6, RDs were generated in <as>:<number> format with <number> in hex form.
<number> should instead be in decimal format

Change-Id: I2786f8dd18d8db91d866f3dc4102c0b1df3a64a1

src/bgp/test/bgp_stress_test.cc

@@ -1018,7 +1018,7 @@ void BgpStressTest::AddBgpInet6VpnRoute(int peer_id, int route_id,
 
     // For odd peer_id's, choose hard-coded value; for even, choose the
     // peer_id. This is to have half of the RD's as dups.
-    string peer_id_str = (peer_id & 1) ? "9999" : integerToHexString(peer_id);
+    string peer_id_str = (peer_id & 1) ? "9999" : integerToString(peer_id);
     // b's in the address for bgp-peer routes
     string pre_prefix = "65412:" + peer_id_str + ":2001:bbbb:bbbb::";
 
@@ -1214,7 +1214,7 @@ void BgpStressTest::DeleteBgpInet6VpnRoute(int peer_id, int route_id,
 
     // For odd peer_id's, choose hard-coded value; for even, choose the
     // peer_id. This is have half of the RD's as dups.
-    string peer_id_str = (peer_id & 1) ? "9999" : integerToHexString(peer_id);
+    string peer_id_str = (peer_id & 1) ? "9999" : integerToString(peer_id);
     // b's in the address for bgp-peer routes
     string pre_prefix = "65412:" + peer_id_str + ":2001:bbbb:bbbb::";
     Inet6VpnPrefix b_prefix6 =