made fstrim optional#2

OmkarDeshpande7 merged 2 commits intorelease-v2.8.1platform9/virt-v2v:release-v2.8.1from

private/release-v2.8.1/fstrimplatform9/virt-v2v:private/release-v2.8.1/fstrimCopy head branch name to clipboard