Add id to cluster manager's log

[masa213f]

This PR fixes the cluster-manager's log.

• Generate an unique string for each cluster-manager's operation. And add it to the log events as operationId filed.
• Output log events on start and end for cluster-manager's operation.
• Record the cause of cluster-manager's operation as origin field.

After

{"level":"info","ts":"2023-02-08T10:55:39Z","msg":"detected mysql pod deletion","controller":"pod","controllerGroup":"","controllerKind":"Pod","Pod":{"name":"moco-single-0","namespace":"foo"},"namespace":"foo","name":"moco-single-0","reconcileID":"dd11da41-a28f-4b3f-9bde-a98bf9cebbbd","name":"moco-single-0"}
{"level":"info","ts":"2023-02-08T10:55:39Z","logger":"cluster-manager.foo/single","msg":"start operation","operationId":"op-6tklf","origin":"dd11da41-a28f-4b3f-9bde-a98bf9cebbbd"}
{"level":"error","ts":"2023-02-08T10:55:44Z","logger":"cluster-manager.foo/single","msg":"failed to get mysqld status","operationId":"op-6tklf","error":"failed to get global variables: pod=moco-single-0, namespace=foo: failed to get mysql global variables: dial tcp 10.244.3.31:33062: i/o timeout","stacktrace":"github.com/cybozu-go/moco/clustering.(*managerProcess).GatherStatus.func2\n\t/work/clustering/status.go:206"}
{"level":"error","ts":"2023-02-08T10:55:52Z","logger":"cluster-manager.foo/single","msg":"failed to get mysqld status","operationId":"op-6tklf","error":"failed to get global variables: pod=moco-single-0, namespace=foo: failed to get mysql global variables: dial tcp 10.244.3.31:33062: i/o timeout","stacktrace":"github.com/cybozu-go/moco/clustering.(*managerProcess).GatherStatus.func2\n\t/work/clustering/status.go:206"}
{"level":"error","ts":"2023-02-08T10:56:00Z","logger":"cluster-manager.foo/single","msg":"failed to get mysqld status","operationId":"op-6tklf","error":"failed to get global variables: pod=moco-single-0, namespace=foo: failed to get mysql global variables: dial tcp 10.244.3.31:33062: i/o timeout","stacktrace":"github.com/cybozu-go/moco/clustering.(*managerProcess).GatherStatus.func2\n\t/work/clustering/status.go:206"}
{"level":"info","ts":"2023-02-08T10:56:03Z","logger":"cluster-manager.foo/single","msg":"update the status information","operationId":"op-6tklf"}
{"level":"info","ts":"2023-02-08T10:56:03Z","logger":"cluster-manager.foo/single","msg":"cluster state is Lost","operationId":"op-6tklf"}
{"level":"info","ts":"2023-02-08T10:56:03Z","logger":"cluster-manager.foo/single","msg":"finish","operationId":"op-6tklf","duration":24.065808786}
{"level":"info","ts":"2023-02-08T10:56:03Z","logger":"cluster-manager.foo/single","msg":"start operation","operationId":"op-bq5jl","origin":"interval"}
{"level":"info","ts":"2023-02-08T10:56:03Z","logger":"cluster-manager.foo/single","msg":"update the status information","operationId":"op-bq5jl"}
{"level":"info","ts":"2023-02-08T10:56:03Z","logger":"cluster-manager.foo/single","msg":"cluster state is Incomplete","operationId":"op-bq5jl"}
{"level":"info","ts":"2023-02-08T10:56:03Z","logger":"cluster-manager.foo/single","msg":"set read_only=0","operationId":"op-bq5jl","instance":0}
{"level":"info","ts":"2023-02-08T10:56:03Z","logger":"cluster-manager.foo/single","msg":"finish","operationId":"op-bq5jl","duration":0.163805937}

Before

{"level":"info","ts":"2023-02-08T06:27:59Z","msg":"detected mysql pod deletion","controller":"pod","controllerGroup":"","controllerKind":"Pod","Pod":{"name":"moco-single-0","namespace":"foo"},"namespace":"foo","name":"moco-single-0","reconcileID":"18a1933d-b42f-4ec5-82be-d4a1513851dc","name":"moco-single-0"}
{"level":"error","ts":"2023-02-08T06:28:05Z","logger":"cluster-manager.foo/single","msg":"failed to get mysqld status","error":"failed to get global variables: pod=moco-single-0, namespace=foo: failed to get mysql global variables: dial tcp 10.244.2.7:33062: i/o timeout","stacktrace":"github.com/cybozu-go/moco/clustering.(*managerProcess).GatherStatus.func2\n\t/work/clustering/status.go:206"}
{"level":"error","ts":"2023-02-08T06:28:13Z","logger":"cluster-manager.foo/single","msg":"failed to get mysqld status","error":"failed to get global variables: pod=moco-single-0, namespace=foo: failed to get mysql global variables: dial tcp 10.244.2.7:33062: i/o timeout","stacktrace":"github.com/cybozu-go/moco/clustering.(*managerProcess).GatherStatus.func2\n\t/work/clustering/status.go:206"}
{"level":"info","ts":"2023-02-08T06:28:16Z","logger":"cluster-manager.foo/single","msg":"update the status information"}
{"level":"info","ts":"2023-02-08T06:28:16Z","logger":"cluster-manager.foo/single","msg":"cluster state is Lost"}
{"level":"info","ts":"2023-02-08T06:28:16Z","logger":"cluster-manager.foo/single","msg":"update the status information"}
{"level":"info","ts":"2023-02-08T06:28:16Z","logger":"cluster-manager.foo/single","msg":"cluster state is Incomplete"}
{"level":"info","ts":"2023-02-08T06:28:16Z","logger":"cluster-manager.foo/single","msg":"set read_only=0","instance":0}

Signed-off-by: Masayuki Ishii masa213f@gmail.com

[kmdkuk]

LGTM