All application can use same configuration by generic
configuration.
Loading cache file can fallback to noappid's directory when not
using appid or not find cache file.
one application writes configuration.
```c++
auto config = DConfig::createGeneric(FileName);
config->setValue("common-configuration", true);
```
other applications read configration can give appid or not to
get the configuration.
Set empty string for DBus caller when using acquireManager.
Log: 配置策略支持应用无关配置，缓存精准匹配到meta是否使用appid
Influence: none
Change-Id: I78b331f9c455617d5dfea6df087b1f4828390974
072dd9562d