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, 7 insertions, 4 deletions

diff --git a/exec/java-exec/src/main/resources/bootstrap-storage-plugins.json b/exec/java-exec/src/main/resources/bootstrap-storage-plugins.json
index 417635a0b..42cddd865 100644
--- a/exec/java-exec/src/main/resources/bootstrap-storage-plugins.json
+++ b/exec/java-exec/src/main/resources/bootstrap-storage-plugins.json
@@ -68,12 +68,13 @@
             "crw", "cr2", "nef", "orf", "raf", "rw2", "rwl", "srw", "x3f"
           ]
         }
-      }
+      },
+      enabled : true
     },
+
     s3: {
       type: "file",
       connection: "s3a://my.bucket.location.com",
-      enabled : false,
       config : {
         "fs.s3a.access.key": "ID",
         "fs.s3a.secret.key": "SECRET"
@@ -124,7 +125,8 @@
           delimiter: ",",
           extractHeader: true
         }
-      }
+      },
+      enabled : false
     },
 
     cp: {
@@ -166,7 +168,8 @@
             "crw", "cr2", "nef", "orf", "raf", "rw2", "rwl", "srw", "x3f"
           ]
         }
-      }
+      },
+      enabled : true
     }
   }
 }