db: add tests for repos (#6112)

* Add Repos.create method

* Fix repo name error handling

* Fix all compile errors

* Update github.com/go-macaron/captcha to fix http issue

* Add repos tests

internal/route/api/v1/org/org.go

@@ -31,8 +31,7 @@ func CreateOrgForUser(c *context.APIContext, apiForm api.CreateOrgOption, user *
 	}
 	if err := db.CreateOrganization(org, user); err != nil {
 		if db.IsErrUserAlreadyExist(err) ||
-			db.IsErrNameReserved(err) ||
-			db.IsErrNamePatternNotAllowed(err) {
+			db.IsErrNameNotAllowed(err) {
 			c.ErrorStatus(http.StatusUnprocessableEntity, err)
 		} else {
 			c.Error(err, "create organization")