Include replica connection info on DBaaS clusters & DBaaS PG pools

[dwilsondo]

The DO public API now includes standby node hostnames (standby_connection and standby_private_connection) in responses for clusters and pools. This PR adds these fields to GoDo. Note, this change only applies to clusters and postgres pools. Read replicas are currently limited to a single node and thus have no standby nodes.

The script below (run as go run main.go >> env.json) calls Get on an existing DB cluster and prints the result as JSON. When run w. the dev branch (development.json) the script includes these keys while the production (prod.json) omits them.

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"os"
	"godo" // development godo, replace w. "github.com/digitalocean/godo" for prod
)

func main() {
	var j bytes.Buffer

	cl := godo.NewFromToken(os.Getenv("DIGITALOCEAN_RO_TOKEN"))
	db, _, _ := cl.Databases.Get(context.TODO(), "a_dbaas_cluster_uuid")

	b, _ := json.Marshal(db)
	_ = json.Indent(&j, b, "", "\t")
	fmt.Printf("%+v\n", string(j.Bytes()))
}

diff --git a/development.json b/prod.json
index b2c9ef3..72dbb1a 100644
--- a/development.json
+++ b/prod.json
@@ -21,24 +21,6 @@
 		"user": "doadmin",
 		"ssl": true
 	},
-	"standby_connection": {
-		"protocol": "postgresql",
-		"uri": "postgresql://doadmin:@replica-db-postgresql-nyc3-YYY-do-user-XXX-0.c.db.ondigitalocean.com:25060/defaultdb?sslmode=require",
-		"database": "defaultdb",
-		"host": "replica-db-postgresql-nyc3-YYY-do-user-XXX-0.c.db.ondigitalocean.com",
-		"port": 25060,
-		"user": "doadmin",
-		"ssl": true
-	},
-	"standby_private_connection": {
-		"protocol": "postgresql",
-		"uri": "postgresql://doadmin:@private-replica-db-postgresql-nyc3-YYY-do-user-XXX-0.c.db.ondigitalocean.com:25060/defaultdb?sslmode=require",
-		"database": "defaultdb",
-		"host": "private-replica-db-postgresql-nyc3-YYY-do-user-XXX-0.c.db.ondigitalocean.com",
-		"port": 25060,
-		"user": "doadmin",
-		"ssl": true
-	},

[danaelhe]

Looks good! Thank you for this contribution! I do not see the standby_connection and standby_private_connection response attributes documented in our API docs- could you add them in there as well? at /openapi

[dwilsondo]

Thanks for the review @danaelhe. The OpenAPI PR is WIP. Will link it back to this change when open.