Merge branch 'rani/inet_gethostbyname_fixes' into ccase/r13b04_dev

* rani/inet_gethostbyname_fixes:
  inet_res_SUITE: testcase fixes for legacy DNS resolver (Solaris 8)
  inet_res: /etc/resolv.conf: use domain as default search list
  inet: delayed/avoided read of /etc/resolv.conf and /etc/hosts
  inet_gethost_native: workaround for empty result hostname on MacOS X
  inet_res_SUITE: testcase fix for empty domain name
  inet:gethostbyname improved to parse IP strings and look up own hostname

OTP-8426  The resolver routines failed to look up the own node name as
          hostname, if the OS native resolver was erroneously configured,
          bug reported by Yogish Baliga, now fixed.

          The resolver routines now tries to parse the hostname as an IP
          string as most OS resolvers do, unless the native resolver is
          used.

          The DNS resolver inet_res and file resolver inet_hosts now do not
          read OS configuration files until they are needed. Since the
          native resolver is default, in most cases they are never needed.

          The DNS resolver's automatic updating of OS configuration file
          data (/etc/resolv.conf) now uses the 'domain' keyword as default
          search domain if there is no 'search' keyword.

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