Refactor repoFinder

- Remove io package and move finder to git package
- Move tempDir and writeFile into test package. They are only used for testing purposes anyway.
- Add a way to specify parent folder for tempDir. Useful for testing nested repos.
- Add new test repos with .git/config files

pkg/git/repo.go

@@ -2,7 +2,6 @@ package git
 
 import (
 	"fmt"
-	"git-get/pkg/io"
 	"git-get/pkg/run"
 	"net/url"
 	"strconv"
@@ -43,8 +42,7 @@ type CloneOpts struct {
 
 // Open checks if given path can be accessed and returns a Repo instance pointing to it.
 func Open(path string) (Repo, error) {
-	_, err := io.Exists(path)
-	if err != nil {
+	if _, err := Exists(path); err != nil {
 		return nil, err
 	}