Add support for min_cpu_platform to instance_template

[rosbo]

Fixes #516

--- PASS: TestAccComputeInstanceTemplate_minCpuPlatform (24.27s)
--- PASS: TestAccComputeInstanceTemplate_preemptible (24.30s)
--- PASS: TestAccComputeInstanceTemplate_address (24.31s)
--- PASS: TestAccComputeInstanceTemplate_basic (24.33s)
--- PASS: TestAccComputeInstanceTemplate_networkIP (24.33s)
--- PASS: TestAccComputeInstanceTemplate_primaryAliasIpRange (24.33s)
--- PASS: TestAccComputeInstanceTemplate_importBasic (24.33s)
--- PASS: TestAccComputeInstanceTemplate_disks (24.34s)
--- FAIL: TestAccComputeInstanceTemplate_subnet_xpn (0.24s)

[danawillow]

totally up to you, but while you're here I wouldn't mind having these set inline in the struct:

instanceProperties := &computeBeta.InstanceProperties{
// stuff
}

[danawillow]

May as well just make "Intel Haswell" a var that gets passed into the config and the check

[ghost]

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