fix(crd): increasing the grace period for virtual machine shutdown (#12)

## Description
 Set the termination grace period for virtual machine to 1 hour

## Why do we need it, and what problem does it solve?
The normal shutdown of a VM can take a long time. 1 hour is chosen as a
compromise default setting.

## What is the expected result?

## Checklist
- [ ] The code is covered by unit tests.
- [ ] e2e tests passed.
- [ ] Documentation updated according to the changes.
- [ ] Changes were tested in the Kubernetes cluster manually.

Signed-off-by: Pavel Tishkov <[email protected]>

Author: fl64

crds/virtualmachine.yaml

@@ -722,7 +722,7 @@ spec:
                 terminationGracePeriodSeconds:
                   format: int64
                   type: integer
-                  default: 60
+                  default: 3600
                   description: |
                     Grace period observed after signalling a VM to stop after which the VM is force terminated.