`memory_capacity_mb` and `disk_capacity_mb` should be treated as strings
`memory_capacity_mb` and `disk_capacity_mb` should be treated as strings

[finishes #136199931]

cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release