Add PrimaryKeySessionAuthenticator #691

Job	Run time
cs-stan / Coding Standard & Static Analysis	25s
testsuite / testsuite-linux (8.4, highest, false)	1m 37s
testsuite / testsuite-linux (8.3, highest, false)	51s
testsuite / testsuite-linux (8.1, highest, false)	42s
testsuite / testsuite-linux (8.1, lowest, false)	30s
testsuite / testsuite-linux (8.2, highest, false)	32s
	4m 37s

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