Update google-startup-scripts.service to enable logging (#399)

Network subsystem remove os rules (#396)

* netplan: add support for default MTU value from mds

MDS will provide us with the user's defined MTU make sure we honor
it on the netplan dropin.

* network: remove OS rules and introduce netplan dhcp overrides

We are removing the backward compatibility OS rules and assuming the
detected available backend. This change also removes the notion of
fallback as it was before. Additionally the rollback logic changed
to "rollback all backends except the active one", the "except the
active one" rule is important to prevent restarting network when
no configuration change's happened.

In the set we are also adding the netplan dhcp overrides directives
that was resulting into misconfigured dhcp routes.

Network subsystem remove os rules (#396)

* netplan: add support for default MTU value from mds

MDS will provide us with the user's defined MTU make sure we honor
it on the netplan dropin.

* network: remove OS rules and introduce netplan dhcp overrides

We are removing the backward compatibility OS rules and assuming the
detected available backend. This change also removes the notion of
fallback as it was before. Additionally the rollback logic changed
to "rollback all backends except the active one", the "except the
active one" rule is important to prevent restarting network when
no configuration change's happened.

In the set we are also adding the netplan dhcp overrides directives
that was resulting into misconfigured dhcp routes.

update dep: golang.org/x/crypto to v0.17.0

NetworkManager: only set secondary interfaces as up (#378)

The primary interface will already be up, by doing "conn up" we are
forcing primary interface to be "reloaded" twice as we just reloaded
the configuration with "conn reload" - by double "reloading" the
primary interface we are forcing it to be unavailable longer than we
need it to.

NetworkManager: only set secondary interfaces as up (#378)

The primary interface will already be up, by doing "conn up" we are
forcing primary interface to be "reloaded" twice as we just reloaded
the configuration with "conn reload" - by double "reloading" the
primary interface we are forcing it to be unavailable longer than we
need it to.

Create systemd-networkd unit tests. (#354)

Update network manager unit tests (#351)

- Create dhclient unit tests.
- Add more test cases to manager unit tests.

Implement retry util (#350)

Refactor utils package to not dump everything unrelated into one file…

… (#352)