Bump xenial to 20190222
Bump xenial to 20190222

This contains a security update for apt:
docker-library/official-images#5330
https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-3462.html

Signed-off-by: Cormier, Jonathan <94278db6987355808b2e44bbe88db00b9ea77e5a@criticallink.com>

sameersbn/docker-redmine,otsuka512/docker-redmine,sameersbn/docker-redmine,otsuka512/docker-redmine,otsuka512/docker-redmine,sameersbn/docker-redmine