Audit: Fix remotehosts NameError, env var corruption, and other bugs

[k-rister]

Jira: PERFNFV-429
Severity: Critical | Audit: 2026-08-01

HIGH:

• remotehosts.py:1577 — thread_loggeer NameError + wrong args (crashes podman log error path)
• remotehosts.py:892 — Missing newline in custom env vars (corrupts all subsequent vars)

MEDIUM:

• kube.py:271 — Default verifications applied to wrong dict
• remotehosts.py:2567,2592 — Missing roadblock_connection_watchdog parameter
• endpoints.py:570 — Unescaped IP regex in re.search
• rickshaw-run.py:1549 — Runtime command only for engine ID 1
• hash_calculator.py:30 — Silent error when marker not found
• schema/remotehosts.json:258 — minLength on object (should be minProperties)