This is an implementation of 8bffcf8e50
that was done in the PR https://github.com/ansible/ansible/pull/48082 to devel.
The changes have been manually brought across to the the stable-2.7 branch as it
cannot be cleanly cherry picked due to the substantial differences in become
between these versions.
Currently we impersonate the `SYSTEM` token in order to elevate our become
process with the highest privileges it has available but there are some edge
cases where the first `SYSTEM` token we come across doesn't have the
`SeTcbPrivilege` which is required for the above. This PR adds a further check
in the search for a `SYSTEM` token to make sure it has the `SeTcbPrivilege`
before continuing.
