Remedying of patchings, version conflicts, classpath issues, etc. ALSO: Switch the Hadoop libraries used on the Spark standalone plugin to Hadoop 2.7.3. The version was previously 2.6.5, to match Cloudera's so-called "Hadoop 2.6.0", but in fact this concordance is not at all necessary... Change-Id: Iafafb64fd60a1ae585375a68173c84fbb82c7e1f