MongoDB Rework

[opadron]

More and more, I'm finding that simple updates to GoBig seldom turn out so simple. This PR, originally meant as just a fix to #42, is a testament to this observation.

Once I switched the mongodb roles to being proper roles (as opposed to dumb wrappers around apt), I knew I needed to add configuration options to meet the inevitably varied needs of those who might want to use them. The more I dug into the docs, though, the more apparent the need to cover use cases requiring replica sets and sharding became.

This code is indeed a WIP, but it should help others to see what I'm going for.

[opadron]

@kotfic PTAL. I don't have access to any resources that I can test this on. Could I send you some playbooks to try on AWS? Hopefully, this shouldn't require much more work to handle the simple case of just installing a stand alone MongoDB.

[kotfic]

@opadron do you have a motivating use-case for the sharding and replication set work? I can deploy to some virtual machines locally to test these out, but they are features of mongo that I am not particularly familiar with, I'll need a pretty straightforward use-case and test playbook.

[opadron]

For now, I think the current example playbook should be enough to reproduce a standalone install of mongo (with a newer version than what's in ubuntu's repos).

  - hosts: mongodb
    roles:
      - role: mongodb
        state: started

[opadron]

@Kitware/gobig Ready for review.

[kotfic]

@opadron looks like there are some string mangling issues (there is a \n in the download url)?

TASK: [mongodb-install | mongodb | pkg | download] **************************** 
<127.0.0.1> REMOTE_MODULE command creates=/opt/mongodb/mongodb-3.2.0.tar.gz curl -o "/opt/mongodb/mongodb-3.2.0.tar.gz" "https://fastdl.mongodb.org/linux/mongodb-linux-x86_64- 3.2.0.tgz"
failed: [minerva] => {"changed": true, "cmd": ["curl", "-o", "/opt/mongodb/mongodb-3.2.0.tar.gz", "https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-\n3.2.0.tgz"], "delta": "0:00:00.012142", "end": "2016-01-18 15:34:49.200065", "rc": 3, "start": "2016-01-18 15:34:49.187923", "warnings": ["Consider using get_url module rather than running curl"]}
stderr: curl: (3) Illegal characters found in URL

FATAL: all hosts have already failed -- aborting

[opadron]

Fixed. Apparently, when you use syntax like the one below for a string block:

my_string: >
    long string that I didn't expect to have a newline at the end

you get a newline tacked onto the end.

Someday, I will understand YAML's syntax. I can dream.

[kotfic]

ansible script is now completing but mongod is throwing an error. From /var/log/mongodb.log:

Error parsing YAML config file: yaml-cpp: error at line 4, column 4: end of map not found
try '/opt/mongodb/3.2.0/bin/mongod --help' for more information

[opadron]

@kotfic PTAL

[kotfic]

@opadron LGTM!