mprove Rancher provider functionality:

- Improves default filtering behavior to filter by container health/healthState
- Optionally allows filtering by service health/healthState
- Allows configuration of refresh interval

docs/toml.md

@@ -1604,6 +1604,12 @@ domain = "rancher.localhost"
 #
 Watch = true
 
+# Polling interval (in seconds)
+#
+# Optional
+#
+RefreshSeconds = 15
+
 # Expose Rancher services by default in traefik
 #
 # Optional
@@ -1611,6 +1617,13 @@ Watch = true
 #
 ExposedByDefault = false
 
+# Filter services with unhealthy states and health states
+#
+# Optional
+# Default: false
+#
+EnableServiceHealthFilter = false
+
 # Endpoint to use when connecting to Rancher
 #
 # Required