Werk #12900: Bulk discovery: Show host count in progress info

Component	Setup
Title	Bulk discovery: Show host count in progress info
Date	Jun 21, 2021
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

During bulk discovery, the output "HOST: discovery successful" is extended to read "[2/5] HOST: discovery successful" to give a better idea of the progress of the jobs.

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