Disabled sanity checks ignored on snapshot restore

Disabling sanity checks on a table is ignored when restoring snapshots. If this is expected behavior at least the error message is misleading.

Steps to Reproduce

1. Create a new table
   create 't', 'cf'
2. Add a coprocessor to the newly created table
   alter 't', METHOD => 'table_att', 'coprocessor' => 'coprocessor.jar|com.example.MyCoprocessor|0'
3. Create a snapshot
   snapshot 't', 'snapshot-t'
4. Disable the table to prevent region servers from crashing in the next step
   disable 't'
5. Delete the coprocessor JAR and restart HBase.
6. Attempt to restore the snapshot leads to failing sanity check as expected
   restore_snapshot 'snapshot-t'
   ERROR: org.apache.hadoop.hbase.DoNotRetryIOException: coprocessor.jar Set hbase.table.sanity.checks to false at conf or table descriptor if you want to bypass sanity checks [...]
7. Disable sanity checks (as described in the error message) and retry
   alter 't', CONFIGURATION => {'hbase.table.sanity.checks' => 'false'}
   restore_snapshot 'snapshot-t'

Expected Behavior

The snapshot is restored.

Actual Behavior

The same error message as in step 6. is shown.