By removing:
User=docker-registry
the service now runs as user root which allows ansible to use the
registry without hitting permissions issues.
Test Plan:
Pass: Execute ansible playbook in Debian OS
Pass: Service is active (running) after ansible playbook
Story: 2009101
Task: 44419
Signed-off-by: Fabricio Henrique Ramos <fabriciohenrique.ramos@windriver.com>
Change-Id: I06f3b0ed19d60400630bd01d3ae115fe44b6582b