[HBASE-15481] Add pre/post roll to WALObserver - ASF JIRA

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Incompatible change
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WALObserver coprocessors now can receive notifications of WAL rolling via the new methods `preWALRoll` and `postWALRoll`.

This change is incompatible due to the addition of these methods to the `WALObserver` interface. Downstream users are encouraged to instead extend the `BaseWALObserver` class, which remains compatible through this change.

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 WALObserver coprocessors now can receive notifications of WAL rolling via the new methods `preWALRoll` and `postWALRoll`. This change is incompatible due to the addition of these methods to the `WALObserver` interface. Downstream users are encouraged to instead extend the `BaseWALObserver` class, which remains compatible through this change.

currently the WALObserver has only a pre/post Write. It will be useful to have a pre/post Roll too.