Remove the "OrDie" from the name (since it doesn't "or die") and add
an extra check that there is at least 1 node available, since many
callers already did that themselves, and many others should have.
This makes sub packages of e2e test framework to use log functions
of core framework instead for avoiding circular dependencies.
NOTE: test/e2e/framework/kubelet, test/e2e/framework/metrics and
test/e2e/framework/node will make circular dependencies if
updating them. It is necessary to solve them in advance before
this work.
