[tests] split tests/ into two subdirectories

[degemer]

Separate agent core tests and all integration tests. I think it looks nicer and cleaner.

It's a WIP for now. I can't/don't want to run all tests locally, so I will fix them once they fail on Travis.

[remh]

👍

[degemer]

Updated and ready, I added:

• remove unused run_check in checks/init.py, which was importing
  from tests.common...
• add a Resources class in tests.integrations.common to ease the use of
  fixtures

[degemer]

Final tree of the tests/ directory:

tests
├── checks # tests of checks.d/*
│   ├── integration # contains all real integration tests
│   ├── mock # contains mocked tests
│   └── resources # files needed by tests
└── core # core agent tests
    └── resources # files needed by tests

I also added a new rake task, rake test:coverage which displays untested & mocked tests:

These PRs will need a rebase: 😢

• [tests] Improve tests for fluentd check. #1574
• [core] use internal /run for pid and pickle files #1569 😢
• Add dogstreams.d for dynamic dogstreams configuration #1557
• Adding dogstream filename globbing support. Fixes #753. #1550
• [ci] replace sleep_for by a function #1547 😢 😢
• Add basic mandrill agent check #1543
• [mesos] Improve mesos integration #1535
• [source] Revamp our source install script #1504
• [core] Collector and Checks metrics Governor #1468 👿
• Add type tag support to fluentd check. #1449
• Add etcd latency metrics #1429
• Fail2ban check #1427
• [metadata] integration metadata collection #1394 👿 👿
• Add the ability to select processes to monitor by regex pattern match #1375
• [osx] Use omnibus-built OS X installer #1361 😑
• Add check for ZFS  #1349
• Allow environment variable substitution in conf file #1343

[LeoCavaille]

Nice! Just a nitpick, I am not a fan of the name Resources (I know I used it in ci/...) it's a bit confusing and it also refers to the processes snapshots used to create the memory treemaps.
Can we use stubs or fixtures maybe?

[LeoCavaille]

LGTM 👍

[brettlangdon]

#1427 and #1543 rebased and tests moved :)

[degemer]

Awesome, thanks @brettlangdon !

[coveralls]

Changes Unknown when pulling 72be48e on quentin/reorgnize-tests into ** on master**.