Use virtual machine for testing

This mode is used to test a distribution of OpenDuT.

OpenDuT-VM

Ensure a distribution of openDuT is present
- By either creating one yourself on your host:
```
cargo ci distribution
```
- Or in the opendut-vm. Within the VM the rust target directory is overridden to /home/vagrant/rust-target. Therefore, you need the to copy the created distribution to the expected location.
```
cargo ci distribution
mkdir -p /vagrant/target/ci/distribution/x86_64-unknown-linux-gnu/
cp ~/rust-target/ci/distribution/x86_64-unknown-linux-gnu/* /vagrant/target/ci/distribution/x86_64-unknown-linux-gnu/
```
- Or by copying one to the target directory target/ci/distribution/x86_64-unknown-linux-gnu/
```
# ensure directory is present
mkdir -p target/ci/distribution/x86_64-unknown-linux-gnu/
# copy distribution to target directory
```
Login to the virtual machine from your host (assumes you have already set up the virtual machine)
```
cargo theo vagrant ssh
```
Start test environment in opendut-vm:
```
cargo theo testenv start
```
Start a cluster in opendut-vm:
```
cargo theo testenv edgar start
```
This will start several EDGAR containers and create an OpenDuT cluster.

openDuT