Do not reload all watched settings when a refresh all is trigger #228
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Why this PR?
When sentinel key is watched for refresh,
If we detect any sentinel key is changed, the provider will reload all selected kvs. Previously, it will also reload all watched settings, this behavior is same as .NET provider. However, as #93 said, .NET provider will also serve watched settings in the configuration, but other providers don't have this behavior. So there is no need to reload all watched settings, since it may cause side effect that we will miss a refresh.
For example,
there are two sentinel keys: key1 and key2
When key1 is changed, we trigger a refresh-all, during the refresh-all, key2 is changed, we reload it. This signal will miss for next refresh call.