Add PrimaryKeySessionAuthenticator #645

Job	Run time
testsuite / testsuite-linux (8.1, lowest, false)	54s
cs-stan / Coding Standard & Static Analysis	30s
testsuite / testsuite-linux (8.2, highest, false)	28s
testsuite / testsuite-linux (8.1, highest, false)	37s
testsuite / testsuite-linux (8.3, highest, false)	34s
testsuite / testsuite-linux (8.4, highest, false)	1m 28s
	4m 31s

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