Copy and store addrinfo in libpq-owned private memory

This refactors libpq to copy addrinfos returned by getaddrinfo to
memory owned by libpq such that future improvements can alter for
example the order of entries.

As a nice side effect of this refactor the mechanism for iteration
over addresses in PQconnectPoll is now identical to its iteration
over hosts.

Author: Jelte Fennema <[email protected]>
Reviewed-by: Aleksander Alekseev <[email protected]>
Reviewed-by: Michael Banck <[email protected]>
Reviewed-by: Andrey Borodin <[email protected]>
Discussion: 
https://postgr.es/m/pr3pr83mb04768e2ff04818eeb2179949f7...@pr3pr83mb0476.eurprd83.prod.outlook.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/44d85ba5a3361dea371d23bd91777ef4c0c4e506

Modified Files
--------------
src/include/libpq/pqcomm.h        |   6 ++
src/interfaces/libpq/fe-connect.c | 112 +++++++++++++++++++++++++++-----------
src/interfaces/libpq/libpq-int.h  |   7 ++-
src/tools/pgindent/typedefs.list  |   1 +
4 files changed, 92 insertions(+), 34 deletions(-)

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