Prevent instance start when user down
Prevent instance start when user down

Prevent starting a given instance when that instance has been shutdown
by the user, given that the instance must be first properly shutdown.

Signed-off-by: Jose A. Lopes <0fb9c4f8511df4ec2ae28af879e9d462f6218a2c@google.com>
Reviewed-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>

andir/ganeti,andir/ganeti,onponomarev/ganeti,bitemyapp/ganeti,dimara/ganeti,ganeti-github-testing/ganeti-test-1,ganeti/ganeti,ganeti-github-testing/ganeti-test-1,mbakke/ganeti,grnet/snf-ganeti,ganeti/ganeti,grnet/snf-ganeti,bitemyapp/ganeti,yiannist/ganeti,mbakke/ganeti,andir/ganeti,apyrgio/ganeti,leshchevds/ganeti,ganeti/ganeti,yiannist/ganeti,leshchevds/ganeti,dimara/ganeti,onponomarev/ganeti,mbakke/ganeti,yiannist/ganeti,apyrgio/ganeti,leshchevds/ganeti