Move some defaults and types from config

The params package should not depend on config. The params packages
should be consumable by external applications that wish to interact with
garm, and it makes no sense to pull in the config package just for some
constants. As such, the following changes have been made:

  * Moved some types from config to params
  * Moved defaults in a new leaf package called appdefaults

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

database/sql/models.go

@@ -17,7 +17,6 @@ package sql
 import (
 	"time"
 
-	"github.com/cloudbase/garm/config"
 	"github.com/cloudbase/garm/params"
 	"github.com/cloudbase/garm/runner/providers/common"
 
@@ -64,8 +63,8 @@ type Pool struct {
 	RunnerBootstrapTimeout uint
 	Image                  string `gorm:"index:idx_pool_type"`
 	Flavor                 string `gorm:"index:idx_pool_type"`
-	OSType                 config.OSType
-	OSArch                 config.OSArch
+	OSType                 params.OSType
+	OSArch                 params.OSArch
 	Tags                   []*Tag `gorm:"many2many:pool_tags;"`
 	Enabled                bool
 	// ExtraSpecs is an opaque json that gets sent to the provider
@@ -140,8 +139,8 @@ type Instance struct {
 	ProviderID    *string `gorm:"uniqueIndex"`
 	Name          string  `gorm:"uniqueIndex"`
 	AgentID       int64
-	OSType        config.OSType
-	OSArch        config.OSArch
+	OSType        params.OSType
+	OSArch        params.OSArch
 	OSName        string
 	OSVersion     string
 	Addresses     []Address `gorm:"foreignKey:InstanceID"`