DP-174 Added pre and post transfers

Updated the format of the benchmark configs so that it has an array of pre and post transfers.
The code will be able to move files between hdfs and s3
DP-174 Added a spinning cursor
DP-174 Removed config files
DP-174 Removed wikilogs-config.json
DP-174 Fixed rubocop errors
DP-174 Made code review changes and added test data

1) Updated hadoop command to check existence of output file with -test -d
2) Added the default exit_code in the wrapper command
3) Added a bare-bokes configuration for testing purposes
DP-174 Removed todo
Merge pull request #4 from AltiPub/aws-dp-174-pre-post-transfer

DP-174 Added pre and post transfers