create presets db and endpoints

[VallariAg]

Presets are user saved config of teuthology-suite commands. This will help rerun commands. The args of a command can be saved by a unique preset id. Data to be stored in a db on teuthology-api.

How the feature could be used in pulpito-ng: ceph/pulpito-ng#47

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Implementation:

Adds database to t-api: SQLite

Schema (improvements can be discussed):

Endpoints:
GET presets/{id}
GET presets/list/
POST presets/add/
UPDATE presets/edit/{id}
DELETE presets/delete/{id}

Implementation PR (previous work): #19