This commit applies the Black format to the `dcdbsync`
files to ensure that it adheres to the Black code style guidelines.
Test Plan:
PASS: Success in stx-distcloud-tox-black
Story: 2011149
Task: 50443
Change-Id: I10596ee3def785fcff04c67e63552aeb304b07bb
Signed-off-by: Hugo Brito <hugo.brito@windriver.com>