[nexus] Make the VPC creation saga unwind-safe, add tests

nexus/db-model/src/ipv4net.rs

@@ -10,9 +10,20 @@ use diesel::sql_types;
 use ipnetwork::IpNetwork;
 use omicron_common::api::external;
 use omicron_common::nexus_config::NUM_INITIAL_RESERVED_IP_ADDRESSES;
+use serde::Deserialize;
+use serde::Serialize;
 use std::net::Ipv4Addr;
 
-#[derive(Clone, Copy, Debug, PartialEq, AsExpression, FromSqlRow)]
+#[derive(
+    Clone,
+    Copy,
+    Debug,
+    PartialEq,
+    AsExpression,
+    FromSqlRow,
+    Serialize,
+    Deserialize,
+)]
 #[diesel(sql_type = sql_types::Inet)]
 pub struct Ipv4Net(pub external::Ipv4Net);
 

nexus/db-model/src/vpc_subnet.rs

@@ -14,10 +14,21 @@ use nexus_types::external_api::params;
 use nexus_types::external_api::views;
 use nexus_types::identity::Resource;
 use omicron_common::api::external;
+use serde::Deserialize;
+use serde::Serialize;
 use std::net::IpAddr;
 use uuid::Uuid;
 
-#[derive(Queryable, Insertable, Clone, Debug, Selectable, Resource)]
+#[derive(
+    Queryable,
+    Insertable,
+    Clone,
+    Debug,
+    Selectable,
+    Resource,
+    Serialize,
+    Deserialize,
+)]
 #[diesel(table_name = vpc_subnet)]
 pub struct VpcSubnet {
     #[diesel(embed)]