Cleaned up BackupTest to reduce execution time.
Set "initialized" flag of partition service before processing partition table. Fixes #2804
fixed encrypted socket communication, fixes #1897
Merge pull request #2922 from eminn/fix/encryption-maintenance

[backport] fixed encrypted socket communication, fixes #1897
Merge pull request #2907 from mdogan/fix/3.2/issue-2804

Fixes data loss issue when  partition table is being synced and a node gracefully shutdown
Merge remote-tracking branch 'hz/maintenance-3.x' into
maintenance-3.x-seeburger