Support certificate based authentication from exec command

[pgalache]

Implements #2157

[linux-foundation-easycla]

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• ✅ login: pgalache / name: Pablo Galache (007bbb3)

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[pgalache]

@yue9944882 could you rerun the workflow? It seems there were some already existing flaky tests. I tested locally with JDK1.8 in Mac several times and it runs OK. In fact, the test that failed is code not affected by the changes in this PR:

org.junit.runners.model.TestTimedOutException: test timed out after 90000 milliseconds
	at sun.misc.Unsafe.park(Native Method)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
	at java.util.concurrent.Semaphore.acquire(Semaphore.java:467)
	at io.kubernetes.client.extended.controller.LeaderElectingControllerTest.testLeaderElectingController(LeaderElectingControllerTest.java:112)

Edit: in fact I see it has also failed here when Mac was added to the matrix build.

[brendandburns]

fwiw that MacOS failure was fixed in the PR before it merged, but I re-triggered testing and we'll see.

[yue9944882]

/lgtm
/approve

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This pull-request has been approved by: pgalache, yue9944882

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