Add $adminvm policy keyword

[marmarek]

Since dom0 is special, it's better to refer to it by special policy keyword, instead of name like any other VM. For example this will make $anyvm not matching $adminvm more logical.
Also, dom0 name is Xen specific, so we will need some flexibility here when porting Qubes to other hypervisor anyway.

For Qubes 4.0, policy will recognize both dom0 and $adminvm.

Cc @rootkovska

[qubesos-bot]

Automated announcement from builder-github

The package qubes-core-dom0-4.0.1-1.fc25 has been pushed to the r4.0 testing repository for dom0.
To test this update, please install it with the following command:

sudo qubes-dom0-update --enablerepo=qubes-dom0-current-testing

Changes included in this update

[qubesos-bot]

Automated announcement from builder-github

The package qubes-core-dom0-4.0.1-1.fc25 has been pushed to the r4.0 testing repository for dom0.
To test this update, please install it with the following command:

sudo qubes-dom0-update --enablerepo=qubes-dom0-current-testing

Changes included in this update