Changes From 8.0.8 RC5 To 8.0.9 RC6

Link to container image of backbeat.

• bugfix: ZENKO-1024 Add pending counters
• Merge branch 'bugfix/ZENKO-1051_Change_to_sentinel_redis_config' into q/8.0
• ZENKO-1051 Add support for redis sentinels
• Merge branch 'bugfix/ZENKO-1050-pauseResumeRework' into q/8.0
• Merge branch 'bugfix/ZENKO-1052-fixContentTypePromclient' into q/8.0
• Merge branch 'bugfix/ZENKO-1047-disableAPIInternalTime' into q/8.0
• bf: ZENKO-1050 pause/resume should delete schedule
• rf: rename and reuse http request method
• ft: ZENKO-1019 add delete for scheduled resume
• bf: ZENKO-1052 send text/plain type for promclient
• bf: disable api internal start timer