Fixed TestHttpServer portRangeTest to use inclusive for min and max port range
Included MinPort in portRangeTest
have a backup plan when append to hdfs failed
change after testing
Merge pull request #983 from Microsoft-CISL/yingdac-support-for-append-op-on-wasb-hdfs

Yingdac support for append op on wasb hdfs
Merge pull request #982 from Microsoft-CISL/tmajest_fix_httpserver_portrange_test

Fixed TestHttpServer portRangeTest to use min to max inclusive for port range
Merge branch 'master' of https://github.com/Microsoft-CISL/REEF into weimer_classpath_cleanups