A few more locking unit tests
A few more locking unit tests

A few more tests written while bug-hunting. One of them shows a real
issue, at last. :)

Reviewed-by: imsnah


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