License checker incorrectly parse the expiry time on 32 bits system.

[ph]

2019-04-04T15:24:21.305+0200    DEBUG    [elasticfetcher]    licenser/elastic_fetcher.go:141    Invalid response from server    {"body": "{\"build\":{\"hash\":\"8453f77\",\"date\":\"2019-03-21T15:34:15.162090Z\"},\"license\":{\"uid\":\"4552d43c-e532-47b1-9552-27fed12f7d1a\",\"type\":\"platinum\",\"mode\":\"platinum\",\"status\":\"active\",\"expiry_date_in_millis\":1588291199999},\"features\":{\"ccr\":{\"available\":true,\"enabled\":false},\"graph\":{\"available\":true,\"enabled\":true},\"ilm\":{\"available\":true,\"enabled\":true},\"logstash\":{\"available\":true,\"enabled\":true},\"ml\":{\"available\":true,\"enabled\":true},\"monitoring\":{\"available\":true,\"enabled\":true},\"rollup\":{\"available\":true,\"enabled\":true},\"security\":{\"available\":true,\"enabled\":true},\"sql\":{\"available\":true,\"enabled\":true},\"watcher\":{\"available\":true,\"enabled\":true}}}"}
2019-04-04T15:24:22.969+0200    ERROR    pipeline/output.go:100    Failed to connect to backoff(elasticsearch(https://842d2a3cdf39e9ae2e0b2c7ca7cea075.us-east-1.aws.found.io:9243)): Connection marked as failed because the onConnect callback failed: cannot retrieve the elasticsearch license: could not extract license information from the server response: could not parse value for expiry time: strconv.Atoi: parsing "1588291199999": value out of range