[SPARK-12666][CORE] SparkSubmit packages fix for when 'default' conf doesn't exist in dependent module#13428

BryanCutler wants to merge 4 commits intoapache:masterapache/spark:masterfrom

BryanCutler:fallback-package-conf-SPARK-12666BryanCutler/spark:fallback-package-conf-SPARK-12666Copy head branch name to clipboard