Zabbix

....I..... [DEV-2097] added tsdb scripts for easier upgrade to pk

Merge in ZBX/zabbix from feature/DEV-2097-6.0 to release/6.0

* commit '5b58be45b8e0e640ea75f4ff774a5d6b000aa4aa': (21 commits)
  .......... [DEV-2097] various script fixes
  .......... [DEV-2097] tsdb - refactored, fixed old chunk_time_interval retrieval on tsdbv1
  .......... [DEV-2097] tsdb - added immediate start of scheduled compression job
  .......... [DEV-2097] tsdb - added update of config.compression_status
  .......... [DEV-2097] tsdb - removed manual compr job execution due to bug
  .......... [DEV-2097] tsdb - use chunk_time_interval from _old hypertable
  .......... [DEV-2097] tsdb scripts - removed set_integer_now_func on scripts without compression
  .......... [DEV-2097] tsdb scripts - added stop on error
  .......... [DEV-2097] added minor style improvements
  .......... [DEV-2097] separated tsb script into with compression and wo
  .......... [DEV-2097] fixed tsdb script
  .......... [DEV-2097] various fixes
  .......... [DEV-2097] added make clean for sqlite
  .......... [DEV-2097] added generated history pk upgrade scripts to gitignore
  .......... [DEV-2097] fixed main makefile
  .......... [DEV-2097] added inclusion of tsdb sqls to dist
  .......... [DEV-2097] removed old sql files that were not generated
  ....I..... [DEV-2097] added gen_history_pk.pl script to generate history pk migration sqls
  .......... [DEV-2097] fixed version retrieval
  .......... [DEV-2097] added tsdb scripts
  ...