Multiply Hit Rate by 100 to calculate expected percentage value (#28)

* Prevent divide by zero error

When there were no hits or misses against a node, the result being returned was NaN as a result of a divide by zero issue. This approach converts the NaN result to a zero.

* Multiply Hit Rate ratio by 100 to calculate percentage

The Hit Rate metric unit is Percent but we are sending a ratio. We need to multiply the ratio by 100 to get a percentage so monitoring rules and metrics make sense.

Resolves #27

Co-authored-by: Erik Ruggles <erikr@tempworks.com>

Program.cs

@@ -335,7 +335,16 @@ private static void Main(string[] args)
                                 channel = "Hit Rate",
                                 unit = PRTGUnit.Percent,
                                 Float=1,
-                                value = SafeGetFloat(() => (Convert.ToDouble(statsInfo.SingleOrDefault(i => i.Key.Equals("keyspace_hits")).Value) / (Convert.ToDouble(statsInfo.SingleOrDefault(i => i.Key.Equals("keyspace_hits")).Value) + Convert.ToDouble(statsInfo.SingleOrDefault(i => i.Key.Equals("keyspace_misses")).Value))).ToString())
+                                value = SafeGetFloat(() => 
+                                    (
+                                        100.0 * 
+                                        Convert.ToDouble(statsInfo.SingleOrDefault(i => i.Key.Equals("keyspace_hits")).Value) / 
+                                        (
+                                            Convert.ToDouble(statsInfo.SingleOrDefault(i => i.Key.Equals("keyspace_hits")).Value) +
+                                            Convert.ToDouble(statsInfo.SingleOrDefault(i => i.Key.Equals("keyspace_misses")).Value)
+                                        )
+                                    ).ToString()
+                                )
                             }
                         },
                         {