build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/github.com/go-openapi/swag/README.md

@@ -0,0 +1,23 @@
+# Swag [![Build Status](https://github.com/go-openapi/swag/actions/workflows/go-test.yml/badge.svg)](https://github.com/go-openapi/swag/actions?query=workflow%3A"go+test") [![codecov](https://codecov.io/gh/go-openapi/swag/branch/master/graph/badge.svg)](https://codecov.io/gh/go-openapi/swag)
+
+[![Slack Status](https://slackin.goswagger.io/badge.svg)](https://slackin.goswagger.io)
+[![license](http://img.shields.io/badge/license-Apache%20v2-orange.svg)](https://raw.githubusercontent.com/go-openapi/swag/master/LICENSE)
+[![Go Reference](https://pkg.go.dev/badge/github.com/go-openapi/swag.svg)](https://pkg.go.dev/github.com/go-openapi/swag)
+[![Go Report Card](https://goreportcard.com/badge/github.com/go-openapi/swag)](https://goreportcard.com/report/github.com/go-openapi/swag)
+
+Contains a bunch of helper functions for go-openapi and go-swagger projects.
+
+You may also use it standalone for your projects.
+
+* convert between value and pointers for builtin types
+* convert from string to builtin types (wraps strconv)
+* fast json concatenation
+* search in path
+* load from file or http
+* name mangling
+
+
+This repo has only few dependencies outside of the standard library:
+
+* YAML utilities depend on `gopkg.in/yaml.v3`
+* `github.com/mailru/easyjson v0.7.7`