Feat flapping and config

Canopsis merge request

• Adding config read/write in db (with init from toml file)
• Handling flapping status in alarm

Prerequisites

A running mongo instance. Exported env var CPS_MONGO_URL.

For reviewers :

• Is the code « pep8 » compliant ?
• Docstring on classes and methods ?
• Code review ?
• Commit messages compatible with the angular spec ?
• Code tested and working ?
• Has the documentation been written ?

Tests

goconvey -workDir ~/go/src/git.canopsis.net/canopsis/go-revolution/canopsis

@bdubois @fdemeulenaere @tgosselin @adewarumez @fpeterschmitt