Add deploy platform

Make Nginx ports configurable

Add new feature for more than one rocketchat.service process

Fix Jinja tests used as filters

Add support for Ubuntu 18.04 (Bionic Beaver)

dont use jinja tests as filters

Allows to start multiple node.js process to utilize more cores.
Configres nginx to loadbalance.
see also:
https://rocket.chat/docs/installation/manual-installation/multiple-instances-to-improve-performance/

 - Reconfigure the primary replSet's host to be `ansible_nodename`
 - Re-order the /etc/hosts lineinfile task to be above the mongodb
   import_tasks

 - From roles: => include_role:
 - Structure inside blocks for error rescue
 - Destroy/Stop vagrant boxes accordingly

 - Debug output api_pre_check and api_check to catch both tasks

 - remove redundant `acl` install for Ubuntu 16
   (Now installing for all dists)

 - More specific than os_family
 - New variable:
  `rocket_chat_dist_specific_packages:`
 - Use when most things will fit the <os_family>.yml (like Debian.yml)
   but not a certain dist. The present example is of Debian 8 vs. 9
   where 9 has no `nodejs` or `npm` packages and must bootstrap `n`
   directly from GH, but `npm` and `nodejs` exist on Debian 8 still.

 - Explicitly define the mongodb upstart init conf path
 - Mongodb repo updates for 3.4
 - Allow tuning of mongodb service name
   - New vars:
     - `rocket_chat_mongodb_service_name`: mongod (string)
     - `rocket_chat_mongodb_org_pkgs`: false (bool)
     - `rocket_chat_mongodb_org_version`: 3.4 (string)
- Implement suggestions from #40 #50
  - Allow fine-grained tuning of `MONGO_URL` inside service files
  - Configure `rocket_chat_mongodb_URI` with jinja2 logic
    - New vars:
      - `rocket_chat_mongodb_user`: ~ (string)
      - `rocket_chat_mongodb_password`: ~ (string)
      - `rocket_chat_mongodb_database`: rocketchat (string)
      - `rocket_chat_mongodb_use_tls`: false (bool)
      - `rocket_chat_mongodb_URI`: computed result
- Move replSet task into mongodb.yml
- Change idempotency of replSet command
  - Now actually check on the JSON output of the
- Add MongoDB.org offical package install task for RHEL
- Vaariabilize `rocket_chat_mongodb_config` for debian packages
     - Set the variable explicitly in the org packages task to match the
       official location
- Fixes: #40 #50 #54 #71

Mongodb changes from @photoninger (Thanks also for #71 as a reference!)

 - Add mongodb_service_name to README
 - Variablize mongodb log to match service name

Fixes: #71