Revert "Attach persistent disk before deleting vm when recreating the vm"

This reverts commit 28dc5752e5d290db1f11ed2b502f9ccae6cd28a8.

Signed-off-by: Phan Le <ple@pivotal.io>

Conflicts:
	bosh-director/lib/bosh/director/cloudcheck_helper.rb
	bosh-director/spec/unit/cloudcheck_helper_spec.rb
Revert "Do not have to check for values as they are alway there from default values"

This reverts commit fa1d55040e7abf818240a9d02e73e11f4a8497a9.
Disk path can configurable

Signed-off-by: Phan Le <ple@pivotal.io>
Delete vm after cleaning the vsphere agent env

Signed-off-by: Phan Le <ple@pivotal.io>