Follow-up from "Draft: Resolve "Forward queries via DoT""

The following discussion from !7199 (merged) should be addressed:

@marka started a discussion:

This needs to end up as a seperate issue. isc_tlsctx_cache_new really should be isc_tlsctx_cache_create and should take a pointer to a NULL pointer to prevent accidentally overwriting a non NULL tlsctx_cache and thereby leaking memory.

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