fix(agent): flush dns cache during initialization #120
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Since our agent is installing some apt packages, some of the apt sources related domains/ips get cached on the runner. This cache prevents our agent from correctly working if apt is used immediately after the agent is installed, as it can be seen from the test-integration job in our CI being flaky.
This PR is also fixing another issue with the test-integration with virtualbox. Using virtualbox as the VM provider in vagrant started to failed recently with the latest version of the runner image for ubuntu-22.04 (ref).
The two are fixed together since it is the only way to make the test-integration CI job to pass reliably.