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/onsi/gomega/internal/vetoptdesc.go

@@ -0,0 +1,22 @@
+package internal
+
+import (
+	"fmt"
+
+	"github.com/onsi/gomega/types"
+)
+
+// vetOptionalDescription vets the optional description args: if it finds any
+// Gomega matcher at the beginning it panics. This allows for rendering Gomega
+// matchers as part of an optional Description, as long as they're not in the
+// first slot.
+func vetOptionalDescription(assertion string, optionalDescription ...interface{}) {
+	if len(optionalDescription) == 0 {
+		return
+	}
+	if _, isGomegaMatcher := optionalDescription[0].(types.GomegaMatcher); isGomegaMatcher {
+		panic(fmt.Sprintf("%s has a GomegaMatcher as the first element of optionalDescription.\n\t"+
+			"Do you mean to use And/Or/SatisfyAll/SatisfyAny to combine multiple matchers?",
+			assertion))
+	}
+}