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Description of problem:

Job execution with concurrency set broken with nilclass at 100 servers out of 116 if batch size >= 100
Version-Release number of selected component (if applicable):

Satellite version 6.11

How reproducible:
Always.

Steps to Reproduce:

Job details for reproducer:
- Type: SSH Command
- Query '*'  (make sure > 100 servers are there)
- Command: 'date'
- Concurrency: 30



Actual results:

Job execution with concurrency set broken with nilclass at 100 servers out of 116 if batch size >= 100

Expected results:
It should not fail.

Additional info:

Issue related to 'Concurrency level limited to: 30 tasks at a time'.
If do not set the concurrency level it successfully processes all ~116 servers. 
If set the concurrency to 30 tasks then it exactly hangs/fails again at ~100

i tested it with various capsule batch sizes in the settings and there it proved that >= 100 it started to fail and with <100 it completed.

Job on ~120 servers with concurrency 30 and the following Capsule batch sizes:
- 50: ok
- 99; ok
- 100: FAIL
- 101: FAIL
- 150: FAIL

Yes, this is a known issue, there's already an older BZ for it, closing as duplicate.

*** This bug has been marked as a duplicate of bug 2068527 ***