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Don't re-check with gcloud for a firewall's existence to fix a potential flake.

Change docker health checker to using `docker ps`

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`docker ps` is a more reliable health check than docker version from past
experiences.

Add timestamps to the liveness e2e test 

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Knock down the timeouts for gce, gce-slow, gke, and gke-slow

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Add a mutex to guard SetUpAt() and TearDownAt() calls - they should not
run in parallel.  There is a race in these calls when there are two pods
using the same volume, one of them is dying and the other one starting.

TearDownAt() checks that a volume is not needed by any pods and detaches the
volume. It does so by counting how many times is the volume mounted
(GetMountRefs() call below).

When SetUpAt() of the starting pod already attached the volume and did not mount
it yet, TearDownAt() of the dying pod will detach it - GetMountRefs() does not
count with this volume.

These two threads run in parallel:

 dying pod.TearDownAt("myVolume")          starting pod.SetUpAt("myVolume")
   |                                       |
   |                                       AttachDisk("myVolume")
   refs, err := mount.GetMountRefs()       |
   Unmount("myDir")                        |
   if refs == 1 {                          |
   |  |                                    Mount("myVolume", "myDir")
   |  |                                    |
   |  DetachDisk("myVolume")               |
   |                                       start containers - OOPS! The volume is detached!
   |
   finish the pod cleanup


Also, add some logs to cinder plugin for easier debugging in the future, add
a test and update the fake mounter to know about bind mounts.

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Remove additional space which broke http link.

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This change removes RuntimeCache in the pod workers and the syncPod() function.
Note that it doesn't deprecate RuntimeCache completely as other components
still rely on the cache.

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Skip kubectl tests that don't work before v1.1 when running against a pre-v1.1 cluster; fixes #18581

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