Pending request block UI

[stgleb]

When UI request to backend stucks in pending state because of problems on backend - UI blocks in waiting for response and in unresponsive.

Steps to reproduce

1. Deploy cluster in GCE with 1 master and 1 node
2. Go to Instance settings in GCE console
3. Update master instance uncheck Allow-Https check box
4. tiller start arguing for connection timeout in logs

Expected result:

We can delete cluster by delete button

Actual result:

UI becomes unresponsive and delete action happens much later.

[saheienko]

This still affects nodes created with the Add node button.

Steps to reproduce:

1. Deploy cluster.
2. Add a node to the ready cluster.
3. If provisioning of the node is failed we can't delete a cluster by the Delete button.

[eldridgeh]

Can't test until adding node is fixed in GCE.