Remove unused db tables

db/migrate/20190617120112_remove_depricated_versions.rb

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+class RemoveDepricatedVersions < ActiveRecord::Migration
+  def change
+    drop_table :depricated_versions
+  end
+end

db/migrate/20190617121716_remove_dnskeys_delegation_signer_id.rb

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+class RemoveDnskeysDelegationSignerId < ActiveRecord::Migration
+  def change
+    remove_column :dnskeys, :delegation_signer_id
+  end
+end

db/migrate/20190617121949_remove_delegation_signers.rb

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+class RemoveDelegationSigners < ActiveRecord::Migration
+  def change
+    drop_table :delegation_signers
+  end
+end

db/migrate/20190617122505_remove_banklink_transactions.rb

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+class RemoveBanklinkTransactions < ActiveRecord::Migration
+  def change
+    drop_table :banklink_transactions
+  end
+end