OnlyOnce preupgrade check (#2037)
OnlyOnce preupgrade check (#2037)

* OnlyOnce preupgrade check

Signed-off-by: Harsh Thakur <2c29c2d8215d60d339bd94cd5eb25a78b20546b2@gmail.com>

* Update preupgradechecks.go

Co-authored-by: Sanket Sudake <1f5849ff67ff0129e2fd86b5f0a4171278dbf63b@gmail.com>
platform9/fission,fission/fission,fission/fission,fission/fission,platform9/fission,fission/fission,platform9/fission,platform9/fission