libzfs: refresh property cache after inheriting userprop

This matches what happens when inheriting a system property

Consider the following program:
	int main() {
		void *zhp = libzfs_init();
		void *dataset = zfs_open(zhp, "zest/__test", 1);

		printf("before:");
		dump_nvlist(zfs_get_user_props(dataset), 2);
		printf("\n");

		zfs_prop_inherit(dataset, "xyz.nabijaczleweli:test", 0);
		printf("after:");
		dump_nvlist(zfs_get_user_props(dataset), 2);
		printf("\n");

		zfs_refresh_properties(dataset);
		printf("refreshed:");
		dump_nvlist(zfs_get_user_props(dataset), 2);
		printf("\n");
	}

And the output before:
	# zfs set xyz.nabijaczleweli:test=hehe zest/__test
	# ./a.out
	before:  xyz.nabijaczleweli:test:
	      value: 'hehe'
	      source: 'zest/__test'

	after:  xyz.nabijaczleweli:test:
	      value: 'hehe'
	      source: 'zest/__test'

	refreshed:

As compared to the output after:
	# zfs set xyz.nabijaczleweli:test=hehe zest/__test
	# ./a.out
	before:  xyz.nabijaczleweli:test:
	      value: 'hehe'
	      source: 'zest/__test'

	after:
	refreshed:

Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Ahelenia Ziemiańska <[email protected]>
Closes #11064
Closes #11911

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