/settings/autofailover should not allow the user to specify a negative value for maxNodes

user is now able to pass in a negative value for max_nodes.

i am not sure whether server is ignoring this value as there is no way to get the current settings through rest api

[2011-07-11 13:42:47,284] - [rest_client] [140735087852704] - INFO - settings/autoFailover params : maxNodes=1&enabled=true&timeout=3600
[2011-07-11 13:42:47,289] - [rest_client] [140735087852704] - INFO - settings/autoFailover response

{'status': '200', 'content-length': '0', 'server': 'Membase Server 1.7.1r-38-g7530d70', 'pragma': 'no-cache', 'cache-control': 'no-cache', 'date': 'Mon, 11 Jul 2011 20:42:45 GMT'}