e2e storage: public API for testsuites, support CSIInlineVolume type for generic resource

Implementing a test suite was impossible outside of the
k8s.io/kubernetes/test/e2e/storage/testsuites package because all
interfaces and structs used by them were private.

As part of revamping the API, genericVolumeTestResource also gets
exported because it is useful for other test suites. Because the
TestResource interface became obsolete a while ago and isn't used
anymore, the new name is just testsuites.VolumeResource.

testpatterns.CSIInlineVolume needs special handling in a few places.
It can now be used in a test pattern for a test suite that uses a
VolumeResource instance.

test/e2e/storage/testpatterns/testpattern.go

@@ -76,6 +76,11 @@ var (
 		Name:    "Inline-volume (default fs)",
 		VolType: InlineVolume,
 	}
+	// DefaultFsEphemeralVolume is TestPattern for "Ephemeral-volume (default fs)"
+	DefaultFsEphemeralVolume = TestPattern{
+		Name:    "Ephemeral-volume (default fs)",
+		VolType: CSIInlineVolume,
+	}
 	// DefaultFsPreprovisionedPV is TestPattern for "Pre-provisioned PV (default fs)"
 	DefaultFsPreprovisionedPV = TestPattern{
 		Name:    "Pre-provisioned PV (default fs)",
@@ -95,6 +100,12 @@ var (
 		VolType: InlineVolume,
 		FsType:  "ext3",
 	}
+	// Ext3EphemeralVolume is TestPattern for "Ephemeral-volume (ext3)"
+	Ext3EphemeralVolume = TestPattern{
+		Name:    "Ephemeral-volume (ext3)",
+		VolType: InlineVolume,
+		FsType:  "ext3",
+	}
 	// Ext3PreprovisionedPV is TestPattern for "Pre-provisioned PV (ext3)"
 	Ext3PreprovisionedPV = TestPattern{
 		Name:    "Pre-provisioned PV (ext3)",
@@ -116,6 +127,12 @@ var (
 		VolType: InlineVolume,
 		FsType:  "ext4",
 	}
+	// Ext4EphemeralVolume is TestPattern for "Ephemeral-volume (ext4)"
+	Ext4EphemeralVolume = TestPattern{
+		Name:    "Ephemeral-volume (ext4)",
+		VolType: CSIInlineVolume,
+		FsType:  "ext4",
+	}
 	// Ext4PreprovisionedPV is TestPattern for "Pre-provisioned PV (ext4)"
 	Ext4PreprovisionedPV = TestPattern{
 		Name:    "Pre-provisioned PV (ext4)",
@@ -138,6 +155,13 @@ var (
 		FsType:     "xfs",
 		FeatureTag: "[Slow]",
 	}
+	// XfsEphemeralVolume is TestPattern for "Ephemeral-volume (xfs)"
+	XfsEphemeralVolume = TestPattern{
+		Name:       "Ephemeral-volume (xfs)",
+		VolType:    CSIInlineVolume,
+		FsType:     "xfs",
+		FeatureTag: "[Slow]",
+	}
 	// XfsPreprovisionedPV is TestPattern for "Pre-provisioned PV (xfs)"
 	XfsPreprovisionedPV = TestPattern{
 		Name:       "Pre-provisioned PV (xfs)",
@@ -162,6 +186,13 @@ var (
 		FsType:     "ntfs",
 		FeatureTag: "[sig-windows]",
 	}
+	// NtfsEphemeralVolume is TestPattern for "Ephemeral-volume (ntfs)"
+	NtfsEphemeralVolume = TestPattern{
+		Name:       "Ephemeral-volume (ntfs)",
+		VolType:    CSIInlineVolume,
+		FsType:     "ntfs",
+		FeatureTag: "[sig-windows]",
+	}
 	// NtfsPreprovisionedPV is TestPattern for "Pre-provisioned PV (ntfs)"
 	NtfsPreprovisionedPV = TestPattern{
 		Name:       "Pre-provisioned PV (ntfs)",