[Spark-21842][Mesos] Support Kerberos ticket renewal and creation in Mesos#19272

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ArtRand wants to merge 23 commits intoapache:masterfrom

d2iq-archive:spark-21842-450-kerberos-ticket-renewal

Commits on Sep 19, 2017

basic implementation of MesosCredentialRenewer
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pull upstream
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Commits on Sep 20, 2017

working through comments
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cleanup
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remove unused imports
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remove debugging code
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Commits on Sep 26, 2017

use 75 percent of renewal time for the first renewal also
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Commits on Oct 16, 2017

addressed comments, still pending testing
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Commits on Oct 18, 2017

final comments
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Commits on Oct 20, 2017

add comments
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Commits on Oct 21, 2017

remove extra thread in MesosCredentialRenewer
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Commits on Oct 30, 2017

refactor credential renewer, addressed comments
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merge upstream
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resolve import problem
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Commits on Oct 31, 2017

cleanup
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more cleanup
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Commits on Nov 6, 2017

move hadoop delegation token management into Mesos renewer
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remove unused imports
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Commits on Nov 8, 2017

no more conditionals, start renewer automatically
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Commits on Nov 10, 2017

addressed comments
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quick fixup, logging was in the wrong place
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Commits on Nov 14, 2017

only renew tokens when using keytab
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Commits on Nov 15, 2017

update tokens, make SparkHadoopUtil methods private
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