Disable inactive handles caching when compiled with sanitizers
When isc_nmhandle_t gets deactivated, it could be just put onto array stack to be reused later to safe some initialization time. Unfortunately, this might hide some use-after-free errors.
Disable the inactive handles caching when compiled with Address or Thread Sanitizer.
(cherry picked from commit 92cce1da)
Closes #3166 (closed)