kadmin, python-kadmin-rs: rework sync for easier use #230

Job	Run time
test (rust)	1m 49s
lint (clippy)	3m 3s
test (sanity)	2m 13s
lint (rustfmt, nightly, rustfmt)	23s
build	1m 29s
check-rust	9s
release	0s
	9m 6s

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