DRILL-227: implement simple metrics framework
DRILL-235: Add configuration parameters to control number of threads and width of queries
DRILL-236 ensure that each minor fragment has at least one entry assigned to it
DRILL-237: Add local mode to QuerySubmitter
DRILL-243: lowercase asc/desc in generated physical plans causes failures
DRILL-244: NPE when updating assignment affinity metric
DRILL-245: NPE in ProtoMap (hazel cache)
DRILL-246: Improve command line parsing for QuerySubmitter