Implement a new policy check workflow (#1317)

* Adding policy_check support into yaml config

* Added policy check model and runtime structs

* Adding BuildPolicyCheckCommand to ProjectCommandBuilder

* Return incorrectly deleted code

* Remove BuildAutoPolicyPlanCommand from ProjectCommandBuilder

* Split runAutoCommand into two functions

runAutoPlanCommand - does what originally RunAutoplancommand was doing
except now it returns CommandResult and []models.ProjectCommandContext
runAutoPolicyCheckCommand - accepts CommandContext, CommandResult, and
[]models.ProjectCommandContext as arguments and runs PolicyCheckStep runner

* Refactor RunCommentCommand
* Remove BuildPolicyCheckCommand and rename StepCmdExec back to TerraformExec
* Add policy step runner logic and conftest interfaces.
* Add show step runner to policy check stage.

* Adding models.PolicyCheckCommand to buildCtx

This also means buildPlanAllCommands call buildCtx twice once with
models.PlanCommand and once with models.PolicyCheckCommand

* Adding new project_command_builder that supports policy_check

* Refactoring PolicyCheck specific logic into a PolicyCheckProjectCommandBuilder

* Moving events.CommandContext to models.CommandContext this will allow me
to remove buildCtx method and move ProjectCommandContext creation into
models package

* Policy Owners might be different types, for that reason we are
refactoring Owners into its own struct with specific keys defining
different owner types

Co-authored-by: Nish Krishnan <nishk@lyft.com>
Co-authored-by: Nish Krishnan <nishkrishnan@users.noreply.github.com>

server/server_test.go

@@ -20,14 +20,10 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"net/url"
-	"path/filepath"
 	"strings"
 	"testing"
 	"time"
 
-	"github.com/runatlantis/atlantis/server/events"
-	"github.com/runatlantis/atlantis/server/events/yaml/valid"
-
 	"github.com/gorilla/mux"
 	. "github.com/petergtz/pegomock"
 	"github.com/runatlantis/atlantis/server"
@@ -49,35 +45,6 @@ func TestNewServer(t *testing.T) {
 }
 
 // todo: test what happens if we set different flags. The generated config should be different.
-func TestRepoConfig(t *testing.T) {
-	t.SkipNow()
-	tmpDir, err := ioutil.TempDir("", "")
-	Ok(t, err)
-
-	repoYaml := `
-repos:
-- id: "https://github.com/runatlantis/atlantis"
-`
-	expConfig := valid.GlobalCfg{
-		Repos: []valid.Repo{
-			{
-				ID: "https://github.com/runatlantis/atlantis",
-			},
-		},
-		Workflows: map[string]valid.Workflow{},
-	}
-	repoFileLocation := filepath.Join(tmpDir, "repos.yaml")
-	err = ioutil.WriteFile(repoFileLocation, []byte(repoYaml), 0600)
-	Ok(t, err)
-
-	s, err := server.NewServer(server.UserConfig{
-		DataDir:     tmpDir,
-		RepoConfig:  repoFileLocation,
-		AtlantisURL: "http://example.com",
-	}, server.Config{})
-	Ok(t, err)
-	Equals(t, expConfig, s.CommandRunner.ProjectCommandBuilder.(*events.DefaultProjectCommandBuilder).GlobalCfg)
-}
 
 func TestNewServer_InvalidAtlantisURL(t *testing.T) {
 	tmpDir, err := ioutil.TempDir("", "")