add server.ContainerTop, server.poolAdd and ser.poolRemove tests
Add CompareConfig test
prevent any kind of operation simultaneously
add Volumes and VolumesFrom to CompareConfig
add VolumesFrom to MergeConfig, and test
rebase master
Modify test to accept error from mkContainer
Merge branch 'master' into add_some_tests
rebase master
rebase
Merge pull request #1216 from dotcloud/add_some_tests

Add some tests in server and utils