vmm/vmware: Ensure nvram file is named "vmware.nvram"
vmm/vmware: Ensure nvram file is named "vmware.nvram"

- When creating a new VMX, add an "nvram" directive to ensure that the
NVRAM file is named "vmware.nvram" rather than "nvram"

- When renaming a VM's files, properly rename the nvram file to
"vmware.nvram", even if it's called "nvram", and update or create the
"nvram" key in the VMX file to match

- When doing the blanket rename of all $basename.* files in the CFGDIR,
error out if the destination of a rename already exists

- Move safe-rename code to a helper function; replace open-coded safe
renames with calls to the helper

- Strip quotation marks from VMX values as soon as they are read, rather
than in each key handler

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr