Add URL encoding for Spider image lookup API call

[jihoon-seo]

• Related issue comment: How to lookup GCP VM image info? cb-spider#339 (comment)
• Resolves How to lookup GCP VM image info? cb-spider#339
• 필요 시, PR Update REST API of LookupImage & LookupSpec #444 를 롤백 할 수도 있습니다.

[테스트 결과]

❯ ./lookupImage.sh gcp 1 jhseo

{
   "Name" : "",
   "Status" : "READY",
   "KeyValueList" : [
      {
         "Key" : "Name",
         "Value" : "ubuntu-minimal-1804-bionic-v20191024"
      },
      {
         "Value" : "",
         "Key" : "SourceImage"
      },
      {
         "Key" : "SourceType",
         "Value" : "RAW"
      },
      {
         "Value" : "https://www.googleapis.com/compute/v1/projects/ubuntu-os-cloud/global/images/ubuntu-minimal-1804-bionic-v20191024",
         "Key" : "SelfLink"
      },
      {
         "Key" : "Family",
         "Value" : "ubuntu-minimal-1804-lts"
      },
      {
         "Key" : "DiskSizeGb",
         "Value" : "10"
      }
   ],
   "IId" : {
      "SystemId" : "https://www.googleapis.com/compute/v1/projects/ubuntu-os-cloud/global/images/ubuntu-minimal-1804-bionic-v20191024",
      "NameId" : "https://www.googleapis.com/compute/v1/projects/ubuntu-os-cloud/global/images/ubuntu-minimal-1804-bionic-v20191024"
   },
   "GuestOS" : "ubuntu-minimal-1804-lts"
}

[seokho-son]

/lgtm

[seokho-son]

/approve