Fixed template substituion when value is None (not found on environment)
Merge remote-tracking branch 'origin/pr/74' into v4

Closes #74.
Revert "Add S3 configuration"
added aws role login to cdh distribution
added aws role login to cdh distribution
added aws role login to cdh distribution
added aws role login to cdh distribution
added aws role login to cdh distribution
non interactive formating
support to apache 2.4
support to apache 2.4
rolling back mapreduce config
rolling back mapreduce config
rolling back mapreduce config