Use cart PR-93 until it lands to master

Signed-off-by: Brian J. Murrell <brian.murrell@intel.com>

Author: brianjmurrell

utils/docker/Dockerfile.centos:7

@@ -111,8 +111,8 @@ RUN pip3.4 install tabulate
 
 RUN if ! $USE_RPMS; then exit 0; fi;                                                                                                                    \
 for ext in cart; do                                                                                                                                     \
-    yum-config-manager --add-repo=https://build.hpdd.intel.com/job/daos-stack/job/${ext}/job/master/lastSuccessfulBuild/artifact/artifacts/;            \
-    echo "gpgcheck = False" >> /etc/yum.repos.d/build.hpdd.intel.com_job_daos-stack_job_${ext}_job_master_lastSuccessfulBuild_artifact_artifacts_.repo; \
+    yum-config-manager --add-repo=https://build.hpdd.intel.com/job/daos-stack/job/${ext}/job/PR-93/lastSuccessfulBuild/artifact/artifacts/;            \
+    echo "gpgcheck = False" >> /etc/yum.repos.d/build.hpdd.intel.com_job_daos-stack_job_${ext}_job_PR-93_lastSuccessfulBuild_artifact_artifacts_.repo; \
 done
 
 ARG CART=unknown