Use datacenter option spelling in consul input (#5320)

plugins/inputs/consul/README.md

@@ -24,8 +24,8 @@ report those stats already using StatsD protocol if needed.
   # username = ""
   # password = ""
 
-  ## Data centre to query the health checks from
-  # datacentre = ""
+  ## Data center to query the health checks from
+  # datacenter = ""
 
   ## Optional TLS Config
   # tls_ca = "/etc/telegraf/ca.pem"

plugins/inputs/consul/consul.go

@@ -17,6 +17,7 @@ type Consul struct {
 	Username   string
 	Password   string
 	Datacentre string
+	Datacenter string
 	tls.ClientConfig
 	TagDelimiter string
 
@@ -38,8 +39,8 @@ var sampleConfig = `
   # username = ""
   # password = ""
 
-  ## Data centre to query the health checks from
-  # datacentre = ""
+  ## Data center to query the health checks from
+  # datacenter = ""
 
   ## Optional TLS Config
   # tls_ca = "/etc/telegraf/ca.pem"
@@ -77,6 +78,10 @@ func (c *Consul) createAPIClient() (*api.Client, error) {
 		config.Datacenter = c.Datacentre
 	}
 
+	if c.Datacenter != "" {
+		config.Datacenter = c.Datacenter
+	}
+
 	if c.Token != "" {
 		config.Token = c.Token
 	}