[WIP] Grant 'superuser' to the members of Postgres admin teams (#371)

Added support for superuser team in addition to the admin team that owns the postgres cluster.

pkg/util/config/config.go

@@ -103,6 +103,7 @@ type Config struct {
 	TeamAPIRoleConfiguration map[string]string `name:"team_api_role_configuration" default:"log_statement:all"`
 	PodTerminateGracePeriod  time.Duration     `name:"pod_terminate_grace_period" default:"5m"`
 	ProtectedRoles           []string          `name:"protected_role_names" default:"admin"`
+	PostgresSuperuserTeams   []string          `name:"postgres_superuser_teams" default:""`
 }
 
 // MustMarshal marshals the config or panics