purefa_alert_open - severity and component_name are reversed

[bonito2907]

Hi,

With the pure-fa-om-exporter v1.0.2, for a host alert, severity and component_name fields are reversed.

Here an example :
purefa_alerts_open{component_name="critical", component_type="host", instance="<flasharray name>", job="<job_name>", severity="<host name>"}

image used :
"Image": "quay.io/purestorage/pure-fa-om-exporter:v1.0.2"

NB: I don't know if the same issue is present for other component types.

Error seems to be on this commit : f3c66dc where the order of parameter seems to be wrong.

[chrroberts-pure]

Fixed in #28