ipatests: Respect platform's openssl dir
    
    There are different build configurations of OpenSSL from one distro
    to another. For example,
    
    Debian: '--openssldir=/usr/lib/ssl',
    Fedora: '--openssldir=/etc/pki/tls',
    openSUSE: '--openssldir=/etc/ssl',
    ALTLinux: '--openssldir=/var/lib/ssl'.
    Signed-off-by: Stanislav Levin <slev@altlinux.org>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>