builder/vmware-vmx: Added tools_upload_flavor support
go fmt
Merge pull request #1154 from rasa/765-add-tools-upload-flavor-support-in-vmware-vmx

builder/vmware-vmx: Added tools_upload_flavor support
builder/vmware/common: tests for StepPrepareTools

/cc @rasa - an example
builder/vmware/common: more tests
fmt
builder/vmware/common: remove unnecessary tags
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