[dockerng] Disable notset check

[ticosax]

_api_mismatch() was a good idea.

But impractical since dockerd doesn't necessarily return all configuration items.

/cc @terminalmage

fixes #29727

[oeuftete]

@ticosax I tested this change against the 2015.8 branch (using my own fork) on my work's states. Getting some issues when I run a subsequent highstate after my initial containers are created. Docker 1.10.2, docker-py 1.5.0. I can try to set up a minimal state if necessary to reproduce:

[ERROR   ] Uncaught exception "'NoneType' object is not iterable" encountered while comparing existing container against desired configuration. Exception info follows:
  File "/usr/lib/python2.7/dist-packages/salt/states/dockerng.py", line 1561, in running
    defaults_from_image)
  File "/usr/lib/python2.7/dist-packages/salt/states/dockerng.py", line 191, in _compare
    actual_ports = sorted(actual_data)

[cachedout]

Let's hold on this until we can work out the possible issue reported by @oeuftete

[rallytime]

Some of the tests that were refactored/improved in #31326 are now failing in the merge-forward I am doing from 2016.3 to develop in #31462. I noticed that the test failures were similar to what this change is trying to solve (hitting the "Unable to compare configuration ..." message.) I just wanted to note that applying this change to my merge-forward branch fixes the test failures.

[ticosax]

@rallytime thanks for the notification.

@oeuftete I could reproduce your use case with

sudo salt-call -l error state.single dockerng.running name=hello image=alpine:3.3 ports=[8000] cmd="/bin/echo 'Hello world'"

I pushed a new commit to that branch.

[cachedout]

Go Go Jenkins!