Add srm feature in vshpere cpi to read settings from vmdk
Add unit test for methods attach_independent_disk, detach_independent_disk and set_vmdk_content in cloud.rb of bosh_vsphere_cpi
Add unit test for create_vm in vsphere cpi
Add unit test for attach_disk in vsphere_cpi
Add unit test for detach_disk in vsphere_cpi
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