better to use FQDN in configure.sh
impala and disk changes

impala has trouble being installed on nodes where an incompatible hive is already installed. So revert back to keeping impala on a few nodes, separate from anywhere hive .13 is installed.

Use instance store by uncommenting the appropriate lines.
Merge branch 'master' of https://github.com/vicenteg/mapr-ansible-roles
don't link hive-site.xml
added TestDFSIO to tests
hue, and other fixes

print URL for Hue

check for existence of instance_id before attempting to print ec2 stuff.