LogFile::getLogFileName 时间规则需要参照g_logTimeZone，

[mosxuqian]

参照Logger::Impl::formatTime来处理，更加合理，并且能够让log文件内容的时间和log文件名保持一致性。

新的代码，如下：
string LogFile::getLogFileName(const string& basename, time_t* now)
{
string filename;
filename.reserve(basename.size() + 64);
filename = basename;
char timebuf[32];
struct tm tm;
*now = time(NULL);
if (g_logTimeZone.valid())
{
tm = g_logTimeZone.toLocalTime(now);
}
else
{
::gmtime_r(&now, &tm); // FIXME TimeZone::fromUtcTime
}
strftime(timebuf, sizeof timebuf, ".%Y%m%d-%H%M%S.", &tm);
filename += timebuf;

filename += ProcessInfo::hostname();

char pidbuf[32];
snprintf(pidbuf, sizeof pidbuf, ".%d", ProcessInfo::pid());
filename += pidbuf;

filename += ".log";

return filename;
}