do not override cwltool installed version

Dockerfile

@@ -23,7 +23,7 @@ COPY welcome.html /app/galaxy/static/welcome.html
 COPY tool_conf.xml /app/galaxy/config/tool_conf.xml
 #COPY init_galaxy.sh /app/galaxy/init_galaxy.sh
 RUN cd /app/galaxy && ./scripts/common_startup.sh 
-RUN cd /app/galaxy && . .venv/bin/activate && pip install cwltool==1.0.20181012180214
+#RUN cd /app/galaxy && . .venv/bin/activate && pip install cwltool==1.0.20181012180214
 RUN cd /app/galaxy && ls database/*
 RUN cd /app/galaxy && ./create_db.sh
 RUN cd /app/galaxy && ./manage_db.sh upgrade