Change execution phase of checkstyle plugin back to default 'verify'

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-site-plugin:3.4:site (default-site) on project hbase: failed to get report for org.apache.maven.plugins:maven-javadoc-plugin: Failed to execute goal org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check (checkstyle) on project hbase-error-prone: Execution checkstyle of goal org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check failed: Plugin org.apache.maven.plugins:maven-checkstyle-plugin:2.17 or one of its dependencies could not be resolved: Failure to find org.apache.hbase:hbase-checkstyle:jar:2.0.0-beta-1 in http://repository.apache.org/snapshots/ was cached in the local repository, resolution will not be reattempted until the update interval of apache.snapshots has elapsed or updates are forced -> [Help 1]