Don't strip documentation from analytics-base container

A follow up to commit e62c5d2, removing 'nodocs' from yum.conf to
disable stripping of the documentation files, which are used for
displaying browseable HTML documentation over analytics-api port.

Closes-Bug: #1765481
Change-Id: I0567b222e787be760e435271affd7fe2d39f4601

containers/analytics/base/Dockerfile

@@ -2,7 +2,8 @@ ARG CONTRAIL_REGISTRY
 ARG CONTRAIL_CONTAINER_TAG
 FROM ${CONTRAIL_REGISTRY}/contrail-base:${CONTRAIL_CONTAINER_TAG}
 
-RUN yum install -y contrail-analytics python-sqlalchemy && \
+RUN sed -e '/^tsflags=nodocs/d' -i /etc/yum.conf && \
+    yum install -y contrail-analytics python-sqlalchemy && \
     yum clean all -y && \
     rm -rf /var/cache/yum