pgsql: Make RADIUS authentication use pg_getaddrinfo_all() to get

Log Message:
-----------
Make RADIUS authentication use pg_getaddrinfo_all() to get address of
the server.

Gets rid of a fairly ugly hack for Solaris, and also provides hostname
and IPV6 support.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        client-auth.sgml (r1.129 -> r1.130)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/client-auth.sgml?r1=1.129&r2=1.130)
    pgsql/src/backend/libpq:
        auth.c (r1.193 -> r1.194)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/libpq/auth.c?r1=1.193&r2=1.194)
        hba.c (r1.196 -> r1.197)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/libpq/hba.c?r1=1.196&r2=1.197)
    pgsql/src/include/port:
        solaris.h (r1.18 -> r1.19)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/port/solaris.h?r1=1.18&r2=1.19)