[HBASE-22776] Rename config names in user scan snapshot feature - ASF JIRA

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Release Note:

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After ~~HBASE-22776~~, the steps to config user scan snapshot feature is as followings:
1. Check HDFS configuration
2. Add master coprocessor:
    hbase.coprocessor.master.classes=
    “org.apache.hadoop.hbase.security.access.AccessController,
org.apache.hadoop.hbase.security.access.SnapshotScannerHDFSAclController”
3. Enable this feature:
    hbase.acl.sync.to.hdfs.enable=true
4. Modify table scheme to enable this feature for a table:
    alter 't1', CONFIGURATION => {'hbase.acl.sync.to.hdfs.enable' => 'true'}

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After HBASE-22776 , the steps to config user scan snapshot feature is as followings: 1. Check HDFS configuration 2. Add master coprocessor:     hbase.coprocessor.master.classes=     “org.apache.hadoop.hbase.security.access.AccessController, org.apache.hadoop.hbase.security.access.SnapshotScannerHDFSAclController” 3. Enable this feature:     hbase.acl.sync.to.hdfs.enable=true 4. Modify table scheme to enable this feature for a table:     alter 't1', CONFIGURATION => {'hbase.acl.sync.to.hdfs.enable' => 'true'}

As discussed in ~~HBASE-22578~~, ~~HBASE-22580~~, the config names are not so proper.

And make the SnapshotScannerHDFSAclCleaner load automatically if this feature is enabled.

links to

GitHub Pull Request #440