Update to cleanup command for adapter

Now cleaning of db is available trough command line interface via
ostfctl util. In order to clean db use "ostfctl cleandb --dbpath
db-connection-string". db-connection-string is optional flag and its
default is for ostf database.

Change-Id: I0e6161e5b1a4d892e4f092b7506ac2e08e1bc2f8