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

traefik.sample.toml

@@ -1046,6 +1046,12 @@
 #
 # Watch = true
 
+# Polling interval (in seconds)
+#
+# Optional
+#
+# RefreshSeconds = 15
+
 # Expose Rancher services by default in traefik
 #
 # Optional
@@ -1053,6 +1059,13 @@
 #
 # ExposedByDefault = false
 
+# Filter services with unhealthy states and health states
+#
+# Optional
+# Default: false
+#
+# EnableServiceHealthFilter = false
+
 # Endpoint to use when connecting to Rancher
 #
 # Required