Description of problem:

Prepare 2 VMs:  t5 uses the shared data disk of st1, 
migrate st1 to target cluster with migrateSharedDisks: true, then migrate st5 with migrateSharedDisks: false, use pvcNameTemplate below, there are two pvc with name: e-1j9njb, e-198bdj for VM st5:

{{if eq .DiskIndex .RootDiskIndex}}c{{else if eq .DiskIndex 1}}e{{else if eq .DiskIndex 2}}f{{else if eq .DiskIndex 3}}g{{else}}data{{end}}-{{.DiskIndex}}

I can separate them by add VmName to the pvcNameTemplate, the pvc names of VM st5 are:

mtv-func-win2022-st1-e-1j9njb, mtv-func-win2022-st5-e-198bdj 

As we need to keep the shared disk pvc name: mtv-func-win2022-st1-e-1j9njb (E in st5 and st1),

the user expect the pvc name(later used in diskname) follow the disk name in VM, (when we start VM st5, the disk: mtv-func-win2022-st5-e-198bdj-2 is F in VM), so it's better to update the mtv-func-win2022-st5-e-198bdj to mtv-func-win2022-st5-f-198bdj

Version-Release number of selected component (if applicable):

MTV 2.8.0

How reproducible:

100%

Steps to Reproduce:

1) Prepare 2 VMs: st5 uses the shared data disk of st1

mtv-func-win2022-st1: 
    Root: sata, C: 16G st1.vmkd 
    Data 1: sata, E: 2G st1_1.vmdk (shared) 
    Data 2: stata, F: 3G st1_2.vmdk (no sharing)
mtv-func-win2022-st5:
    Root: sata, C: 16G st5.vmkd (no sharing)
    Data 1: sata, E: 2G st1_1.vmdk (shared - use mtv-func-win2022-st1 shared data 1)
    Data 2: sata, F: 3G st5_2.vmdk (no sharing)

2)  Migrate st1 to target cluster with migrateSharedDisks: true, then migrate st5 with migrateSharedDisks: false with pvcNameTemplate: 

{{.VmName}}-{{if eq .DiskIndex .RootDiskIndex}}c{{else if eq .DiskIndex 1}}e{{else if eq .DiskIndex 2}}f{{else if eq .DiskIndex 3}}g{{else}}data{{end}}-{{.DiskIndex}} 

3) Check the pvc name, there are two e, I separate them by adding vm name to pvc name: st1-e, st5-e.

    The user expect the pvc name(later used in diskname) follow the disk name in VM, (when we start VM st5, the disk: mtv-func-win2022-st5-e-198bdj-2 is F in VM), so it's better to update the mtv-func-win2022-st5-e-198bdj to mtv-func-win2022-st5-f-198bdj