add simple cli entrypoints for api functionality

[vdloo]

like:

hypernode-api-python]$ ls bin/
block_attack				get_app_flavor				get_product_info
check_payment_information_for_app	get_app_info				get_sla
check_xgrade				get_available_backups_for_app		get_slas
command					get_block_attack_descriptions		get_whitelist_options
create_brancher				get_cluster_relations			get_whitelist_rules
destroy_brancher			get_current_product_for_app		validate_app_name
get_active_branchers			get_eav_description			xgrade
get_active_products			get_flows
get_app_configurations			get_next_best_plan_for_app

hypernode-api-python]$ ./bin/get_sla --help
usage: get_sla [-h] sla_code

Get a specific SLA.

$ ./bin/get_sla sla-standard
{
  "id": 123,
  "code": "sla-standard",
  "name": "SLA Standard",
  "price": 1234,
  "billing_period": 1,
  "billing_period_unit": "month"
}

positional arguments:
  sla_code    The code of the SLA to get

optional arguments:
  -h, --help  show this help message and exit

[tdgroot]

Nice addition! :)