Don't attempt to canonicalize peer name in Kerberos/GSSAPI/SSPI auth #574

Job	Run time
test-postgres (9.5)	4m 12s
test-platforms (3.8, ubuntu-latest, asyncio)	3m 21s
test-postgres (9.6)	4m 0s
test-postgres (10)	3m 47s
test-platforms (3.8, ubuntu-latest, uvloop)	3m 25s
test-postgres (11)	3m 49s
test-postgres (12)	4m 32s
test-platforms (3.8, macos-latest, asyncio)	3m 38s
test-postgres (13)	3m 57s
test-platforms (3.8, macos-latest, uvloop)	3m 31s
test-postgres (14)	3m 52s
test-postgres (15)	3m 42s
test-platforms (3.8, windows-latest, asyncio)	5m 7s
test-postgres (16)	4m 6s
test-platforms (3.9, ubuntu-latest, asyncio)	3m 28s
test-platforms (3.9, ubuntu-latest, uvloop)	3m 24s
test-platforms (3.9, macos-latest, asyncio)	3m 13s
test-platforms (3.9, macos-latest, uvloop)	3m 13s
test-platforms (3.9, windows-latest, asyncio)	5m 33s
test-platforms (3.10, ubuntu-latest, asyncio)	3m 13s
test-platforms (3.10, ubuntu-latest, uvloop)	3m 14s
test-platforms (3.10, macos-latest, asyncio)	3m 9s
test-platforms (3.10, macos-latest, uvloop)	3m 10s
test-platforms (3.10, windows-latest, asyncio)	5m 26s
test-platforms (3.11, ubuntu-latest, asyncio)	3m 18s
test-platforms (3.11, ubuntu-latest, uvloop)	3m 18s
test-platforms (3.11, macos-latest, asyncio)	3m 26s
test-platforms (3.11, macos-latest, uvloop)	3m 11s
test-platforms (3.11, windows-latest, asyncio)	5m 7s
test-platforms (3.12, ubuntu-latest, asyncio)	3m 30s
test-platforms (3.12, macos-latest, asyncio)	3m 11s
test-platforms (3.12, windows-latest, asyncio)	5m 23s
Regression Tests	1s
	2h 2m 27s

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