util: Consolidate and improve workarounds for clang-tidy issue 58992

We have several workarounds for a clang-tidy bug where the checker doesn't
recognize that a number of system calls write to - and therefore initialise
- a socket address.  We can't neatly use a suppression, because the bogus
warning shows up some time after the actual system call, when we access
a field of the socket address which clang-tidy erroneously thinks is
uninitialised.

Consolidate these workarounds into one place by using macros to implement
wrappers around affected system calls which add a memset() of the sockaddr
to silence clang-tidy.  This removes the need for the individual memset()
workarounds at the callers - and the somewhat longwinded explanatory
comments.

We can then use a #define to not include the hack in "real" builds, but
only consider it for clang-tidy.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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