message: Switch tests to use docker library alpine image
diff: -FROM williamyeh/ansible:centos7
  +FROM alpine:3.10
  -RUN yum -y install git && yum clean all && pip install pyjwt requests
  +RUN apk add --no-cache \
  + ansible \
  + bash \
  + git \
  + openssh-client \
  + py2-jwt \
  + py2-requests \
  + rsync
  RUN git config --global user.email "deploytest@amazee.io" && git config --global user.name deploytest
  