ATLAS-3064: Resolving repo URL and Maven version.

dev-support/atlas-docker/Dockerfile

@@ -14,7 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM ubuntu:16.04
+FROM ubuntu:18.04
 
 # Install Git, which is missing from the Ubuntu base images.
 RUN apt-get update && apt-get install -y git python
@@ -35,7 +35,7 @@ ENV PATH /usr/java/bin:/usr/local/apache-maven/bin:/usr/local/sbin:/usr/local/bi
 WORKDIR /root
 
 # Pull down Atlas and build it into /root/atlas-bin.
-RUN git clone http://git.apache.org/atlas.git -b master
+RUN git clone https://github.com/apache/atlas.git -b master
 
 # Remove -DskipTests if unit tests are to be included
 RUN mvn clean install -DskipTests -Pdist,embedded-hbase-solr -f ./atlas/pom.xml