Add very simple job queue
Add very simple job queue

Reviewed-by: iustinp


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