Fixes fatal linter errors in android.net.metrics
This patch changes how Event classes are organized:
- Base IpConnectivityEvent class does not implement Parcelable because
it cannot be final (has children). It also becomes abstract because
it is not supposed to be instantiated and logged directly.
- All children classes becomes final because they are Parcelable.
- All constructors of all children classes become private, because they
are supposed to be instantiated with their associated logEvent()
methods.
- All instance fields of all children classes become public final.
Rational: if private, the ConnectivityMetrics app cannot read
their data.
Bug:
28204408
Change-Id: I1a4689c422230c6ed034307dec54a61daf8a6598