Add PrimaryKeySessionAuthenticator #649

Job	Run time
testsuite / testsuite-linux (8.2, highest, false)	34s
cs-stan / Coding Standard & Static Analysis	26s
testsuite / testsuite-linux (8.3, highest, false)	29s
testsuite / testsuite-linux (8.1, lowest, false)	31s
testsuite / testsuite-linux (8.1, highest, false)	38s
testsuite / testsuite-linux (8.4, highest, false)	1m 13s
	3m 51s

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