Fix ldap child memory hierarchy and other issues

The timeout handler was not a child of the request so it could fire even though
the request was already freed.

The code wouldn't use async writes to the children so it could incur in a short
write with no way to detect or recover from it.
Also fixed style of some helper functions to pass explicit paramters instead of
a general structure.
Add common code to do async writes to pipes.
Fixed async write issue for the krb5_child as well.

Fix also sdap_kinit_done(), a return statement was missing and we were mixing
SDAP_AUTH and errno return codes in state->result

Remove usless helper function that just replicates talloc_strndup()

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