Namespace creation in partition change/breakage in 1.12.0+ent

Overview of the Issue

We had some code using consul/api to create namespaces in a partition, which worked in Consul 1.11.5+ent but does not in 1.12.0+ent.

The following will create ns-1 in partition part-1 in 1.11.5+ent. With 1.12.0+ent, it creates ns-1 in the default partition. Basically, the Partition field is now being ignored, it seems.

// Ignores(?) the Partition field in 1.12.0+ent
ns, _, err := client.Namespaces().Create(&api.Namespace{
    Partition: "part-1",
    Name:      "ns-1",
}, nil)

Note that specifying the partition in query parameters works in both versions, for example:

// Works in both 1.11.5+ent and 1.12.0+ent
ns, _, err := client.Namespaces().Create(&api.Namespace{
    Name: "ns-1",
}, &api.WriteOptions{Partition: "part-1"})

Reproduction Steps

Steps to reproduce this issue:

Run Consul 1.12.0+ent (consul agent -dev ...)
Run the following script which creates a partition and namespace.

Expand for script

```go package main import ( "context" "log" "github.com/hashicorp/consul/api" ) func main() { cfg := api.DefaultConfig() client, err := api.NewClient(cfg) part, _, err := client.Partitions().Create(context.Background(), &api.Partition{ Name: "part-1", }, nil) if err != nil { log.Fatal(err) } log.Printf("created partition %s", part.Name) ns, _, err := client.Namespaces().Create(&api.Namespace{ Partition: part.Name, Name: "ns-1", }, nil) if err != nil { log.Fatal(err) } log.Printf("created namespace %s in %s", ns.Name, ns.Partition) } ```

The output will look like, where namespace ns-1 is created in the default partition.

$ go run .
2022/04/22 10:27:35 created partition part-1
2022/04/22 10:27:35 created namespace ns-1 in default

Consul info for both Client and Server

Client info

``` $ consul-ent info agent: check_monitors = 0 check_ttls = 0 checks = 0 services = 0 build: prerelease = revision = 7f7df338 version = 1.12.0 consul: acl = enabled bootstrap = false known_datacenters = 1 leader = true leader_addr = 127.0.0.1:8300 server = true license: customer = 7c020610-60a2-7ccb-c210-20d899e5f3b4 expiration_time = 2022-09-13 23:59:59.999 +0000 UTC features = Automated Backups, Automated Upgrades, Enhanced Read Scalability, Network Segments, Redundancy Zone, Advanced Network Federation, Namespaces, SSO, Audit Logging, Admin Partitions id = 7b3c59fd-2e64-7cf8-5445-5247c0a11ae8 install_id = * issue_time = 2021-09-13 15:25:19.052900132 +0000 UTC modules = Global Visibility, Routing and Scale, Governance and Policy product = consul start_time = 2021-09-13 00:00:00 +0000 UTC raft: applied_index = 19 commit_index = 19 fsm_pending = 0 last_contact = 0 last_log_index = 19 last_log_term = 2 last_snapshot_index = 0 last_snapshot_term = 0 latest_configuration = [{Suffrage:Voter ID:516ea538-2bec-a543-0883-7569d49f89e6 Address:127.0.0.1:8300}] latest_configuration_index = 0 num_peers = 0 protocol_version = 3 protocol_version_max = 3 protocol_version_min = 0 snapshot_version_max = 1 snapshot_version_min = 0 state = Leader term = 2 runtime: arch = amd64 cpu_count = 16 goroutines = 128 max_procs = 16 os = darwin version = go1.18.1 serf_lan: coordinate_resets = 0 encrypted = false event_queue = 2 event_time = 3 failed = 0 health_score = 0 intent_queue = 0 left = 0 member_time = 1 members = 1 query_queue = 0 query_time = 1 serf_wan: coordinate_resets = 0 encrypted = false event_queue = 0 event_time = 1 failed = 0 health_score = 0 intent_queue = 0 left = 0 member_time = 1 members = 1 query_queue = 0 query_time = 1 ```

Server info

``` output from server 'consul info' command here ```

hashicorp / consul