DRILL-6494: Drill Plugins Handler

- Storage Plugins Handler service is used op the Drill start-up stage and it updates storage plugins configs from
  storage-plugins-override.conf file. If plugins configs are present in the persistence store - they are updated,
  otherwise bootstrap plugins are updated and the result configs are loaded to persistence store. If the enabled
  status is absent in the storage-plugins-override.conf file, the last plugin config enabled status persists.
- 'drill.exec.storage.action_on_plugins_override_file' Boot option is added. This is the action, which should be
  performed on the storage-plugins-override.conf file after successful updating storage plugins configs.
  Possible values are: "none" (default), "rename" and "remove".
- The "NULL" issue with updating Hive plugin config by REST is solved. But clients are still being instantiated for disabled
  plugins - DRILL-6412.
- "org.honton.chas.hocon:jackson-dataformat-hocon" library is added for the proper deserializing HOCON conf file
- additional refactoring: "com.typesafe:config" and "org.apache.commons:commons-lang3" are placed into DependencyManagement
  block with proper versions; correct properties for metrics in "drill-override-example.conf" are specified

closes #1345

1 files changed, 4 insertions, 3 deletions

diff --git a/contrib/storage-jdbc/src/test/resources/bootstrap-storage-plugins.json b/contrib/storage-jdbc/src/test/resources/bootstrap-storage-plugins.json
index add980847..4018d9247 100755
--- a/contrib/storage-jdbc/src/test/resources/bootstrap-storage-plugins.json
+++ b/contrib/storage-jdbc/src/test/resources/bootstrap-storage-plugins.json
@@ -2,15 +2,16 @@
     "storage" : {
         derby : {
           type    : "jdbc",
-          enabled : true,
           driver  : "org.apache.derby.jdbc.ClientDriver",
-          url     : "jdbc:derby://localhost:${derby.reserved.port}/memory:${derby.database.name};user=root;password=root"
+          url     : "jdbc:derby://localhost:${derby.reserved.port}/memory:${derby.database.name};user=root;password=root",
+          enabled : true
         },
         mysql : {
           type    : "jdbc",
           enabled : true,
           driver  : "com.mysql.jdbc.Driver",
-          url     : "jdbc:mysql://localhost:${mysql.reserved.port}/${mysql.database.name}?user=root&password=root&useJDBCCompliantTimezoneShift=true"
+          url     : "jdbc:mysql://localhost:${mysql.reserved.port}/${mysql.database.name}?user=root&password=root&useJDBCCompliantTimezoneShift=true",
+          enabled : true
       }
     }
 }