Fix check_mysql.c client options from file (#1199)

[Sam Kottler]

@awiddersheim your strace output actually exposes another bug, but I'll file
an issue for that. Here's the problem I see right now:

```
stat("/root/..cnf", 0x7fff7c4e6620) = -1 ENOENT (No such file or directory)
```

That should be `/.root/.my.cnf`, but that's the aforementioned bug. This
patch causes the cycle of checking which `my.cnf` to ignore the one that may
exist in a user's homedir.

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