Fix ipc_mode comparison in the latest docker

In old docker, if you do not specify ipc_mode, the default value is empty,
but in the latest docker, such as 17.09.0, if not specified, the default
is "IpcMode": "shareable", which will cause all containers to be deleted
and re-create when to redeploy or upgrade. This commit solves the
problem.

Change-Id: Ia8269b9c8066880e4aee23d6fdea8d9c04c41e44
Closes-Bug: #1747586