Fix (some) failing tests

Found a couple of failing tests on Alpine Linux and OpenBSD. For the
tests to even run `ip4-localhost` has to be changed to an IP-address
(127.0.0.1). `ip4-localhost` is typically not part of `/etc/hosts`.

Output failing tests:

```
not ok 5
udp: 0
prefix: tls:
listen [1]:
    host: localhost
    port: 9025
flushing deferred data to fd 9
selecting... max_fd=11 num_probing=0
activity on fd8
closing fd 8
closing fd 9
selecting... max_fd=11 num_probing=0
#   Failed test at ./t line 59.
#          got: '1'
#     expected: 'sslh-select: Connect and write nothing'
```

```
not ok 22 - sslh-select:ssh: probe connected correctly
#   Failed test 'sslh-select:ssh: probe connected correctly'
#   at ./t line 59.
#          got: 'regex'
#     expected: 'ssh'
```

```
not ok 68 - sslh-select:ssh: probe connected correctly
#   Failed test 'sslh-select:ssh: probe connected correctly'
#   at ./t line 59.
#          got: 'regex'
#     expected: 'ssh'
```

Diff works around issues causing tests 22 and 68 to fail. As of yet, no
workaround for test 5 has been found.

test.cfg

@@ -32,7 +32,7 @@ listen:
 (
     { host: "localhost"; port: "8080"; keepalive: true; },
     { host: "localhost"; port: "8081"; keepalive: true; },
-    { host: "ip4-localhost"; is_udp: true; port: "8086"; }
+    { host: "127.0.0.1"; is_udp: true; port: "8086"; }
 );
 
  
@@ -46,7 +46,7 @@ protocols:
      { name: "xmpp";  host: "localhost"; port: "9009"; },
      { name: "adb";  host: "localhost"; port: "9010"; },
      { name: "syslog"; host: "localhost"; port: "9013"; },
-     { name: "regex"; host: "ip4-localhost"; is_udp: true; port: "9020";
+     { name: "ssh"; host: "127.0.0.1"; is_udp: true; port: "9020";
          udp_timeout: 30;
          regex_patterns: [ "^foo" ];
      },