Reconnect when server role changed #468

Job	Run time
test-postgres (9.5)	3m 35s
test-postgres (9.6)	3m 4s
test-platforms (3.8, ubuntu-latest, asyncio)	2m 20s
test-postgres (10)	3m 37s
test-platforms (3.8, ubuntu-latest, uvloop)	2m 13s
test-postgres (11)	2m 45s
test-platforms (3.8, macos-latest, asyncio)	2m 59s
test-postgres (12)	3m 30s
test-platforms (3.8, macos-latest, uvloop)	3m 22s
test-postgres (13)	3m 7s
test-platforms (3.8, windows-latest, asyncio)	5m 58s
test-postgres (14)	2m 59s
test-platforms (3.9, ubuntu-latest, asyncio)	2m 16s
test-postgres (15)	3m 30s
test-platforms (3.9, ubuntu-latest, uvloop)	2m 14s
test-postgres (16)	3m 10s
test-platforms (3.9, macos-latest, asyncio)	2m 36s
test-platforms (3.9, macos-latest, uvloop)	3m 0s
test-platforms (3.9, windows-latest, asyncio)	6m 36s
test-platforms (3.10, ubuntu-latest, asyncio)	2m 10s
test-platforms (3.10, ubuntu-latest, uvloop)	2m 7s
test-platforms (3.10, macos-latest, asyncio)	3m 54s
test-platforms (3.10, macos-latest, uvloop)	3m 5s
test-platforms (3.10, windows-latest, asyncio)	5m 54s
test-platforms (3.11, ubuntu-latest, asyncio)	2m 10s
test-platforms (3.11, ubuntu-latest, uvloop)	2m 8s
test-platforms (3.11, macos-latest, asyncio)	3m 0s
test-platforms (3.11, macos-latest, uvloop)	5m 51s
test-platforms (3.11, windows-latest, asyncio)	6m 34s
test-platforms (3.12, ubuntu-latest, asyncio)	2m 30s
test-platforms (3.12, macos-latest, asyncio)	5m 24s
test-platforms (3.12, windows-latest, asyncio)	6m 56s
Regression Tests	1s
	1h 54m 35s

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