Switch first DNS from ldap-kha.kha.mirantis.net (172.18.208.44)
to ldap-bud.bud.mirantis.net(172.18.176.6)

PROD-35295

Change-Id: Ibba696e9b2d8ed52c89e9c194bdefeac29169015
diff --git a/tcp_tests/templates/_heat_environments/us-cloud.env b/tcp_tests/templates/_heat_environments/us-cloud.env
index b5d0961..87b40ef 100644
--- a/tcp_tests/templates/_heat_environments/us-cloud.env
+++ b/tcp_tests/templates/_heat_environments/us-cloud.env
@@ -43,4 +43,4 @@
   net_public: public
 
   foundation_image: system.foundation
-  nameservers: 172.18.208.44
+  nameservers: 172.18.224.6,172.18.176.6