Filter hosts in settings host-enum

[iLLiCiTiT]

Description

Host enumerator should be used in most of cases when host names should be filled but sometimes it is required to limit host names to only few of them.

Changes

• hosts-enum entity has new attribute hosts_filter where can be defined host names which will be available in enum
• hosts filter is validated
  • at least one host must remain from all hosts
  • if host from filter is not available then warning is logged (Should raise and exception?)
• added hosts filter for "workfiles on startup" where standalonepublisher is skipped

[jakubjezek001]

love this!