HBASE-8662 [rest] support impersonation

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HBASE-8662 [rest] support impersonation - ADDENDUM

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HBASE-8662 [rest] support impersonation - ADDENDUM 2

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HBASE-8953 TestFromClientSide.testClientPoolThreadLocal fails; DEBUG

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HBASE-8943 TestRegionMergeTransactionOnCluster#testWholesomeMerge may fail due to race in opening region

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HBASE-8952 Missing error handling can cause RegionServer RPC thread to busy loop forever

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HBASE-8955 TestStochasticLoadBalancer timedout

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HBASE-8909. HBASE-6170 broke hbase.regionserver.lease.period config, we should support it for BC

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HBASE-8909. HBASE-6170 broke hbase.regionserver.lease.period config, we should support it for BC (add missing file)

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HBASE-8956 A couple of small misspellings thoughout the codebase.

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HBASE-8838 [WINDOWS] FileLink assumptions are broken under NTFS

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HBASE-8954 TestSplitLogWorker#testPreemptTask failed

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HBASE-8935 IntegrationTestBigLinkedList fails under load on 0.94 due to some scan issues - add logging

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