Vault support force_default_lease_duration

### Description
- Vault support parameter `force_default_lease_duration`

### Motivation
- Vault agent injector doesn't react to manual secret rotation. Until there is an official way, we want it to check more often. No change to actual secret on vault server side
- This change can help simplifying rotation testing

### Expected behavior
```hcl
vault {
force_default_lease_duration = true
default_lease_duration = "60s"
}
```

https://github.com/hashicorp/consul-template/blob/08826810124703e7593e825a772e92f14edc77d4/dependency/vault_common.go#L156-L158

Change this FROM
```go
if base <= 0 {
```
TO
```go
if base <= 0 || force {
```

### References

Are there any other GitHub issues (open or closed) that should
be linked here? For example:
- https://github.com/hashicorp/vault-k8s/issues/614

- [x] Im able to contribute