use private IP addresses when launching instances from inside the VPC. Inside the VPC is the only reasonably simple way to deal with starting and stopping instances.
removed mapr_version and mapr_cluster_name from top level playbook, relocated to group_vars/all.
use hi1.4xlarge instead of m3.xlarge
added prereqs for edge node, and scaffold for role variables.

group_vars/all is used for cluster name and version.
add mapr_cluster to role variables
added hostname to mysql perms
better handling for CLDB and JT testing
Merge branch 'role-variables' of https://github.com/vicenteg/mapr-ansible-roles into vpc-local

Conflicts:
	playbooks/aws_bootstrap.yml
fixed typo
hive .13 by default, and a slightly improved way to find the hive installation dir.
update the playbook and inventory template to handle both spot and on demand instances
add mapr_cluster_name to role variables.
make cluster 6 nodes, and ensure separation of services
create the hive warehouse directory. Hue complains without it.
massive cleanup makes the builds work better.
reordered to install metrics earlier
install hive .12 and hive .13 for impala and hue, respectively.
colon to semicolon
playbook was running many times due to wrong format.
added hue and impala host groups