CLOUDSTACK-7930, CLOUDSTACK-7931: Do not allow to set invalid values for global settings which are of type integer and float

This closes #41

Author: anshulgangwar

server/src/com/cloud/configuration/ConfigurationManagerImpl.java

@@ -725,6 +725,21 @@ private String validateConfigurationValue(String name, String value, String scop
             type = c.getType();
         }
 
+        String errMsg = null;
+        try {
+            if (type.equals(Integer.class)) {
+                errMsg = "There was error in trying to parse value: " + value + ". Please enter a valid integer value for parameter " + name;
+                Integer.parseInt(value);
+            } else if (type.equals(Float.class)) {
+                errMsg = "There was error in trying to parse value: " + value + ". Please enter a valid float value for parameter " + name;
+                Float.parseFloat(value);
+            }
+        } catch (Exception e) {
+            // catching generic exception as some throws NullPointerException and some throws NumberFormatExcpeion
+            s_logger.error(errMsg);
+            return errMsg;
+        }
+
         if (value == null) {
             if (type.equals(Boolean.class)) {
                 return "Please enter either 'true' or 'false'.";