virt: Separate aexpect spawn kill method

Signed-off-by: Chris Evich <cevich@redhat.com>
virt-sandbox: Implement sandbox virt-test sub-test

Signed-off-by: Chris Evich <cevich@redhat.com>
virt-sandbox: Implement date test

Signed-off-by: Chris Evich <cevich@redhat.com>