Implement /datasource/{ds}/indexes

Can be used to query the status of indexes on all tables of a project, or to start updates for all indexes.
refactor opal_upload, implement updating of view indexes

Started a refactor to have opal_upload support more types of operations
Implement updating of all indexes in a project that could be changed.
Implement delete and replace operations for automatic upload
Add timestamps to log output of automatic upload
Merge branch 'master' into SESI-72_automating_opal_data_import
refactor opal_upload; implement option to delete processed files; hide password in logs; update sample conf file
remove commented out/unneeded code
Merge pull request #15 from thehyve/SESI-72_automating_opal_data_import

Sesi 72 automating opal data import