Remove vtable method class prefix with --disable-name-namespacing #2722

Job	Run time
docs	46s
check-cfg	20s
msrv	48s
minimal	13s
quickchecking	20s
rustfmt-clippy	27s
test-book	4s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 25s
test-expectations (ubuntu-latest)	36s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 25s
test-no-headers	37s
test-expectations (macos-latest)	36s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 37s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 40s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	1m 40s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	1m 40s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	1m 39s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	1m 39s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	1m 28s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	1m 41s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	1m 42s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	1m 41s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	1m 42s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	1m 41s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	1m 41s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	1m 28s
test (ubuntu-latest, 16.0, 0, 0, 1)	1m 29s
test (macos-latest, 16.0, 0, 0, 0)	1m 40s
success	1s
	33m 46s

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