VULTR：KVM月付2.5美元起/充值送50美元/15机房/支持微信支付宝

测试信息：
东京（日本）           https://hnd-jp-ping.vultr.com/vultr.com.1000MB.bin
洛杉矶（美国）         https://lax-ca-us-ping.vultr.com/vultr.com.1000MB.bin
西雅图（美国）         https://wa-us-ping.vultr.com/vultr.com.1000MB.bin
硅谷（美国）           https://sjo-ca-us-ping.vultr.com/vultr.com.1000MB.bin
法兰克福（德国）       https://fra-de-ping.vultr.com/vultr.com.1000MB.bin
巴黎（法国）           https://par-fr-ping.vultr.com/vultr.com.1000MB.bin
阿姆斯特丹（荷兰）     https://ams-nl-ping.vultr.com/vultr.com.1000MB.bin
伦敦（英国）           https://lon-gb-ping.vultr.com/vultr.com.1000MB.bin
纽约（美国）           https://nj-us-ping.vultr.com/vultr.com.1000MB.bin
芝加哥（美国）         https://il-us-ping.vultr.com/vultr.com.1000MB.bin
亚特兰大（美国）       https://ga-us-ping.vultr.com/vultr.com.1000MB.bin
迈阿密（美国）         https://fl-us-ping.vultr.com/vultr.com.1000MB.bin
达拉斯（美国）         https://tx-us-ping.vultr.com/vultr.com.1000MB.bin
新加坡                 https://sgp-ping.vultr.com/vultr.com.1000MB.bin
悉尼（澳大利亚）       https://syd-au-ping.vultr.com/vultr.com.1000MB.bin