Sample2. Creating ubuntu instance using set of files

1. AMI selection moved to separate ami.tf
2. Instance settings parametized by terraform variables
3. Created variable files: terraform.tfvars, variables.tf
4. Example for list element selection in vpc_security_group_ids
5. Example for map element lookup in instance_type

# setup your AMS access parameters in ~/.aws

# Init terraform 
terraform init
# Create instance
terraform apply