Test automated leader election

• Смерть лидера приводит к перевыборам.
• Sigstop лидера приводит к перевыборам.
• Timeout на фоловере не приводит к остановке записи на лидере.

added 1 deleted label

mentioned in commit a3658fb2

By Yaroslav Dynnikov on 2022-02-22T14:05:10 (imported from GitLab)

mentioned in commit 4fd7f7f6

By Yaroslav Dynnikov on 2022-02-22T16:00:33 (imported from GitLab)

mentioned in merge request !55 (merged)

By Yaroslav Dynnikov on 2022-02-22T16:07:42 (imported from GitLab)

added 1 deleted label and removed 1 deleted label

mentioned in merge request !1136 (merged)

mentioned in commit a01d5d53

mentioned in commit c4060e44

mentioned in commit 389cc903

mentioned in commit b9da3d28