util-lib: move things that parse ifnames to shared/

In subsequent commits, calls to if_nametoindex() will be replaced by a wrapper
that falls back to alternative name resolution over netlink. netlink support
requires libsystemd (for sd-netlink), and we don't want to add any functions
that require netlink in basic/. So stuff that calls if_nametoindex() for user
supplied interface names, and everything that depends on that, needs to be
moved.

src/basic/in-addr-util.c

@@ -439,42 +439,6 @@ int in_addr_from_string_auto(const char *s, int *ret_family, union in_addr_union
         return -EINVAL;
 }
 
-int in_addr_ifindex_from_string_auto(const char *s, int *family, union in_addr_union *ret_addr, int *ret_ifindex) {
-        _cleanup_free_ char *buf = NULL;
-        const char *suffix;
-        int r, ifindex = 0;
-
-        assert(s);
-        assert(family);
-        assert(ret_addr);
-
-        /* Similar to in_addr_from_string_auto() but also parses an optionally appended IPv6 zone suffix ("scope id")
-         * if one is found. */
-
-        suffix = strchr(s, '%');
-        if (suffix) {
-                if (ret_ifindex) {
-                        /* If we shall return the interface index, try to parse it */
-                        ifindex = parse_ifindex_or_ifname(suffix + 1);
-                        if (ifindex < 0)
-                                return ifindex;
-                }
-
-                s = buf = strndup(s, suffix - s);
-                if (!buf)
-                        return -ENOMEM;
-        }
-
-        r = in_addr_from_string_auto(s, family, ret_addr);
-        if (r < 0)
-                return r;
-
-        if (ret_ifindex)
-                *ret_ifindex = ifindex;
-
-        return r;
-}
-
 unsigned char in4_addr_netmask_to_prefixlen(const struct in_addr *addr) {
         assert(addr);